W911SA-20-Q-3088 FM DC - Attachment 8 - NADCA ACR Booklet.pdf

ACR The NADCA Standard • 2013 1

ACR

The NADCA Standard for Assessment, Cleaning, and Restoration of HVAC Systems

The International Standard Developed by the National Air Duct Cleaners Association (NADCA)

ACR-13 Committee Roster Bill Lundquist, ASCS, CVC, Chairman . . . . . . . . . . Monster VAC Inc . (Denver, CO) Bill Benito, ASCS, CVI . . . . . . . . . . . . . . . . . . . . . . . . . . Connecticut Steam Cleaning Inc . (South Windsor, CT) Brad Kuhlmann, ASCS . . . . . . . . . . . . . . . . . . . . . . . . Midwest Duct Cleaning Services (Merriam, KS) Richard Lantz, ASCS, CVI . . . . . . . . . . . . . . . . . . . . . . Air Duct Cleaners of Virginia (Chesapeake, VA) Greg Long, ASCS, CIEC . . . . . . . . . . . . . . . . . . . . . . . . IAQ Consulting Services, Inc . (Belton, TX) Rick MacDonald, ASCS CVI . . . . . . . . . . . . . . . . . . . . Armstrong Heating & Power Vac (Manchester, NH)

Technical Consultants Patrick O’Donnell, ASCS, CVC, CIEC . . . . . . . . . . . . Enviro Team North America (Ft . Lauderdale, FL)

Technical Editor Jodi Araujo, CEM

Project Management Association Headquarters, Mt . Laurel, NJ

Published by National Air Duct Cleaners Association (NADCA) 15000 Commerce Parkway, Suite C Mt . Laurel, NJ 08054 Toll Free: (855) GO-NADCA | P: (856) 380-6810 | F: (856) 439-0525

Copyright © 2013 by NADCA All rights reserved .

No part of this publication may be reproduced in any form – mechanical, electronic or otherwise – without prior express written consent of the publisher .

Printed in the United States of America .

ACR The NADCA Standard • 20132

DISCLAIMER

The National Air Duct Cleaners Association (NADCA) has developed and published the Assessment, Cleaning, and Restoration of HVAC Systems (“ACR 2013” or the “Standard”) . The Standard is intended to provide information for assessing new and existing HVAC systems, evaluating the cleanliness of HVAC system components, and guiding the cleaning and restoration of HVAC systems to a specific level of cleanliness . The Standard is also intended to assist individuals and entities establish and maintain their professional competence while working in the duct cleaning industry . All persons using the Standard must be, and remain, updated and informed about developments in the duct cleaning industry so that he/she may implement changes in technology and procedures as appropriate, as well as adhere to all applicable federal, state, provincial, and local laws and regulations . Since every cleaning and restoration job project is unique, in certain circumstances, common sense, experience, and professional judgment may justify a deviation from the information provided in the Standard . Furthermore, this Standard is not intended to be either exhaustive or inclusive of all pertinent requirements, methods, systems, or procedures that might be appropriate on a particular job . The information upon which this Standard is based is subject to change, which may modify, supplemental or invalidate any or all of the information contained herein .

ALL PERSONS USING THE STANDARD, AS A CONDITION OF USE, AGREES THAT NEITHER NADCA, NOR ANY ACR 2013 COMMITTEE MEMBER OR CONTRIBUTOR SHALL NOT BE LIABLE FOR ANY DAMAGES OF ANY NATURE WHATSOEVER, INCLUDING WITHOUT LIMITATION, ANY AND ALL SPECIAL, INCIDENTAL, COMPENSATORY, CONSEQUENTIAL, PUNITIVE, OR OTHER DAMAGES (INCLUDING DAMAGES FOR PERSONAL INJURY OR BODILY INJURY, PROPERTY DAMAGE, LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE AND GROSS NEGLIGENCE), PRODUCT LIABILITY, OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER DIRECT OR INDIRECT, ARISING FROM OR RELATING TO THE PUBLICATION, USE OF, OR RELIANCE ON, THE INFORMATION CONTAINED IN THIS STANDARD . THE FOREGOING LIMITATION AND NEGATION OF DAMAGES IS A FUNDAMENTAL CONDITION OF THE USE OF THE INFORMATION CONTAINED IN THIS STANDARD AND THIS DOCUMENT WOULD

NOT BE PUBLISHED WITHOUT SUCH LIMITATIONS .

While the information contained within this Standard is provided in good faith and is believed to be reliable, NADCA makes no representations, warranties, or guarantees as to the accuracy or completeness of any information contained in this Standard, or that following this Standard will result in compliance with any applicable laws, rules, or regulations; or will result in the safe, satisfactory, or complete performance of a duct cleaning project . NADCA does not warrant, assure, certify or guarantee that adherence to this Standard will or result in any energy savings or correct any indoor air quality related concerns . Any instruction or directive issued by a governmental or regulatory “Authorities Having Jurisdiction” with respect to the assessment and/or remediation of mold shall supersede any contradictory information included in the Standard .

ALL PERSONS USING THE STANDARD, AS A CONDITION OF USE, AGREES THAT ALL WARRANTIES, EXPRESS OR IMPLIED, ARE DISCLAIMED BY NADCA (and its committee members and contributors), INCLUDING WITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY OR COMPLETENESS OF THE INFORMATION, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE OR USE, ITS MERCHANTABILITY, ITS NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY

RIGHTS, OR ANY OTHER EXPRESS OR IMPLIED WARRANTY WHICH MAY EXIST OR APPLY .

In publishing this document, NADCA is not undertaking to render scientific, professional, medical, legal, or other advice or services for, or on behalf of, any person or entity, or to perform any duty owed by any person or entity to others . Any and all use of or reliance upon this Standard is at the user’s own discretion and risk . All persons using the Standard should understand the limitations of the information provided in the Standard, and should rely on his or her own independent judgment, or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given situation .

ACR The NADCA Standard • 2013 3

ACR Committee Roster - - - - - - - - - - - - - - - - Page 1 Disclaimer - - - - - - - - - - - - - - - - - - - - - - - Page 2 Foreword - - - - - - - - - - - - - - - - - - - - - - - - Page 4 Purpose - - - - - - - - - - - - - - - - - - - - - - - - - Page 5 Scope - - - - - - - - - - - - - - - - - - - - - - - - - - Page 5 Application - - - - - - - - - - - - - - - - - - - - - - - Page 5 Qualifications - - - - - - - - - - - - - - - - - - - - - - Page 5 Limitations - - - - - - - - - - - - - - - - - - - - - - - Page 5

Determining the Need for HVAC Cleaning & Restoration - - - - - - - - - - - - - - - - - - - - - - - Page 6

Section 1 Inspections 1 .0 Overview - - - - - - - - - - - - - - - - - - - - - - Page 7 1 .1 When to Perform an Inspection - - - - - - - - - - Page 7 1 .2 HVAC Inspector Qualification - - - - - - - - - - - Page 7 1 .3 HVAC Pre-Inspection - - - - - - - - - - - - - - - - Page 7 1 .4 Appropriate Environmental Engineering Controls - - - - - - - - - - - - - - - - - - - - - - - - - Page 7 1 .5 Routine HVAC Inspection - - - - - - - - - - - - - Page 7 1 .6 HVAC System Inspection-Construction, Retrofit and Remodel - - - - - - - - - - - - - - - - - Page 7 1 .7 Performing HVAC System Component Inspections - - - - - - - - - - - - - - - - - - - - - - - Page 7 1 .8 Exposure to Hazardous Materials - - - - - - - - - Page 8 1 .9 Inspecting for Mold Contamination - - - - - - - Page 8 1 .10 System Assessment - - - - - - - - - - - - - - - - Page 8

Section 2 Work Plans 2 .0 Overview - - - - - - - - - - - - - - - - - - - - - - Page 9 2 .1 Purpose - - - - - - - - - - - - - - - - - - - - - - - Page 9 2 .2 Scope of Work - - - - - - - - - - - - - - - - - - - Page 9 2 .3 Means and Methods - - - - - - - - - - - - - - - - Page 9 2 .4 Other Trades and Their Tasks - - - - - - - - - - - Page 9 2 .5 Project Schedule - - - - - - - - - - - - - - - - - - Page 9 2 .6 Work Site Communication Plan - - - - - - - - - - Page 9 2 .7 Product Submittals - - - - - - - - - - - - - - - - Page 9 2 .8 Safety Plan & Safety Concerns - - - - - - - - - - - Page 9 2 .9 Disclaimers - - - - - - - - - - - - - - - - - - - - - Page 9

Section 3 Engineering Controls for HVAC Cleaning and Restoration Projects 3 .0 Overview - - - - - - - - - - - - - - - - - - - - - - Page 11 3 .1 Equipment Maintenance - - - - - - - - - - - - - Page 11 3 .2 Fuel-powered Equipment - - - - - - - - - - - - - Page 11 3 .3 Vacuum Equipment Exhausting Indoors - - - - - Page 11 3 .4 Negative Pressure Requirements - - - - - - - - - Page 11 3 .5 Handling of Contaminated Materials - - - - - - - Page 11 3 .6 Ambient Air Cleaning - - - - - - - - - - - - - - - Page 11 3 .7 Control of Product Emissions - - - - - - - - - - - Page 11 3 .8 Negative Pressure Failure - - - - - - - - - - - - - Page 11 3 .9 Level 1 Containment - - - - - - - - - - - - - - - - Page 12 3 .10 Level 2 Containment (Temporary Barriers) - - - Page 12 3 .11 Level 3 Containment - - - - - - - - - - - - - - - Page 13 3 .12 Level 4 Containment - - - - - - - - - - - - - - - Page 13 3 .13 Summary of Engineering Controls - - - - - - - Page 13

Section 4 Cleaning and Restoration Procedures 4 .0 Overview - - - - - - - - - - - - - - - - - - - - - - Page 15 4 .1 Negative Duct Pressurization - - - - - - - - - - - Page 15 4 .2 Service Openings - - - - - - - - - - - - - - - - - Page 15 4 .3 Cleaning and Restoration of HVAC Systems - - - - - - - - - - - - - - - - - - - - - - - - - Page 16 4 .4 Wet Cleaning, Power Washing, and Steam Cleaning - - - - - - - - - - - - - - - - - - - - - - - - Page 16 4 .5 Vacuum Collection Equipment - - - - - - - - - - Page 16 4 .6 Confined Space Cleaning - - - - - - - - - - - - - Page 16 4 .7 Air-Handling Unit (AHU) Cleaning - - - - - - - - Page 16 4 .8 Air Duct Cleaning - - - - - - - - - - - - - - - - - Page 17 4 .9 Dampers - - - - - - - - - - - - - - - - - - - - - - Page 17 4 .10 Registers, Grilles, Diffusers - - - - - - - - - - - - Page 17 4 .11 Smoke and/or Fire Detection Equipment - - - - Page 17 4 .12 Coil Surface Cleaning - - - - - - - - - - - - - - - Page 17 4 .13 Control of Odors and Product Emissions - - - - Page 18 4 .14 Remediation of Mold Contamination - - - - - - Page 18 4 .15 Restoration and Repair of Mechanical Systems - - - - - - - - - - - - - - - - - - - - - - - - - Page 18 4 .16 Surface Treatments - - - - - - - - - - - - - - - - Page 18 4 .17 Removal of Mold Contaminated Porous Materials - - - - - - - - - - - - - - - - - - - - - - - - Page 18 4 .18 Cleaning Fibrous Glass Duct System Components - - - - - - - - - - - - - - - - - - - - - - Page 19 4 .19 Resurfacing Fibrous Glass Surfaces - - - - - - - Page 19 4 .20 Damaged Fibrous Glass Material - - - - - - - - Page 19 4 .21 Thermal-Acoustic HVAC Insulation Replacement - - - - - - - - - - - - - - - - - - - - - - Page 19 4 .22 Non-Porous Material Restoration - - - - - - - - Page 19 4 .23 Flooding/Water Damage - - - - - - - - - - - - - Page 19 4 .24 Fire/Smoke Damage - - - - - - - - - - - - - - - Page 19 4 .25 HVAC System Repair - - - - - - - - - - - - - - - Page 20

Section 5 Cleanliness Verification and Documentation 5 .0 Overview - - - - - - - - - - - - - - - - - - - - - - Page 21 5 .1 When to Perform Cleanliness Verification - - - - Page 21 5 .2 Description of Method 1-Visual Inspection - - - Page 21 5 .3 Description of Method 2 - Surface Comparison Testing - - - - - - - - - - - - - - - - - - Page 21 5 .4 Description of Method 3 - NADCA Vacuum Test - Page 21 5 .5 Passing Criteria for NADCA Vacuum Test - - - - - Page 23 5 .6 Post-Project Documentation - - - - - - - - - - - Page 23

Definitions - - - - - - - - - - - - - - - - - - - - - - - Page 25

Reference Documents and Resources - - - - - - - - Page 29

Form to Request Formal Interpretations - - - - - - - Page 31

The NADCA Standard - Table of Contents

ACR The NADCA Standard • 20134

FOREWORD

Assessment, Cleaning, and Restoration of HVAC Systems (ACR The NADCA Standard) is unique in that it is a performance standard that also provides minimum procedural requirements . This Standard has evolved from procedural-based guidelines, standards of care, and research originating from the National Air Duct Cleaners Association (NADCA), along with associated organizations . It is based on reliable principles, review of applicable industry literature and information, and practical experience .

This Standard establishes minimum performance requirements for assessing new and existing HVAC systems, evaluating the cleanliness of HVAC system components, determining the need to clean and cleaning and restoring systems to a verifiable cleanliness level . The Standard also focuses on preventing job-related hazards, such as exposure to workers and occupants, and cross-contamination to the indoor environment .

This document is written for use by those involved in the HVAC cleaning and restoration industry including specifiers, consultants, contractors and end users . Users of this document should stay updated and informed about changes in the industry and implement changes in technology and procedures, as appropriate, while following applicable federal, state, provincial, and local laws and regulations .

All HVAC cleaning and restoration projects are unique and, in certain circumstances, common sense, experience, and professional judgment may justify deviation from this Standard . It is the responsibility of the contractor, or others relying on this Standard, to verify on a case-by-case basis, that application of this Standard is appropriate . When in doubt, use caution and seek additional professional guidance . Users of this document assume all risks and liabilities resulting from use of, and reliance upon, this Standard .

ACR is a living document that is subject to change as more information regarding the HVAC cleaning and restoration industry becomes available and advancements are made in technology and practice . ACR 2013 will be reviewed, evaluated, and validated through application in the field and thereafter revised and improved as deemed necessary .

ACR The NADCA Standard • 2013 5

GENERAL

PURPOSE

This Standard defines the minimum performance and procedural requirements for the assessment, cleaning and restoration of heating, ventilation and air conditioning (HVAC) systems . ACR 2013 supersedes all previous editions of the NADCA ACR Standard and is considered the standard of care for the HVAC cleaning and restoration industry .

SCOPE

This Standard applies to all HVAC assessment, cleaning and restoration services as defined herein . It does not include the cleaning of non-ducted ceiling plenums and items such as the mechanical repair of electrical or pneumatic components of any kind, repair of high pressure vessels, gas/oil controls or preventative maintenance tasks as prescribed by, or recommended by, the original equipment manufacturer (OEM) .

APPLICATION

ACR 2013 provides minimum standards and guidance for industry professionals, HVAC assessment, cleaning and restoration service providers, building owners, and others who manage HVAC systems and projects .

QUALIFICATIONS

Those responsible for performing work to this Standard shall be properly trained and qualified and possess relevant knowledge and experience before performing work of any type on HVAC Systems .

Industry certifications such as the Air Systems Cleaning Specialist (ASCS) or equivalent certification, may demonstrate minimum qualifications .

LIMITATIONS

This Standard does not specifically address any and all hazards or risks that could be encountered when performing work in accordance with this document . Instead, the user is directed to rely on the Authority Having Jurisdiction in such cases .

ACR The NADCA Standard • 20136

Determining the Need for HVAC Cleaning & Restoration It is recommended that HVAC systems be cleaned when a proper HVAC cleanliness inspection or building history indicates one or more of the following conditions exist:

· The HVAC system is contaminated with an accumulation of particulate;

· The HVAC system performance is compromised due to contamination build-up;

· The HVAC system has been determined to be a source of unacceptable odors;

· The HVAC system is discharging visible dirt or debris into the conditioned space;

· The HVAC system has been contaminated as a result of fire, smoke, and/or water damage;

· The HVAC system has been infested with birds, rodents, insects, or their byproducts;

· The HVAC system has been determined to be at risk for fire hazard;

· The HVAC system has become contaminated with construction debris or dust;

· Mold contamination conditions have reached either Condition 2 or Condition 3;

· Deterioration of fiber glass duct liner, duct board, or other porous components;

· As part of an HVAC maintenance program as defined in ANSI/ASHRAE/ACCA Standard 180;

· As part of the HVAC equipment manufacturers recommended maintenance practices;

· As part of a proactive energy management program;

· As part of a proactive indoor air quality management program;

· As a component to achieve LEED Certification;

· When a newly installed component or duct has been contaminated with construction and/or other dust and debris .

NOTE: If there is any question on the need to clean, the NADCA Surface Comparison Test or NADCA Vacuum Test may be performed to assist in determining the need for cleaning . These tests are described in detail in Section 5 of this Standard .

ACR The NADCA Standard • 2013 7

Section 1 – Inspections

1.0 Overview: Inspections are an important component

of any HVAC cleaning and restoration project . HVAC inspections shall be performed to determine the need for cleaning . HVAC inspections shall also be performed to determine the scope of work, engineering controls, safety measures and tools and equipment necessary to perform a cleaning and restoration project .

1.1 When to Perform an Inspection: Inspections shall

be performed before and after HVAC cleaning and restoration projects . It is also recommended that routine inspections be performed as part of a proactive energy and indoor air quality management plan.

1.2 HVAC Inspector Qualification: It is recommended

that a qualified HVAC inspector, such as an Air Systems Cleaning Specialist (ASCS), Certified Ventilation Inspector (CVI), or equivalent, be used to determine the preliminary state of HVAC system cleanliness . At minimum, such personnel shall have a verifiable working knowledge of basic HVAC system design, fundamental HVAC engineering practices, current industry HVAC cleaning and restoration techniques, and applicable industry standards . Individuals who are inspecting for microbial contamination shall be qualified (through training and experience) and licensed (where applicable by law) to determine Conditions 1, 2 and 3 .

1.2.1 Risk Assessment: Prior to conducting an

inspection of the HVAC system the inspector shall have a clear understanding what impact the inspection process may have on the building environment and its occupants .

1.3 HVAC Pre-Inspection: HVAC plans, building plans, and understanding the layout of the home or building will provide important information needed to establish the scope of work . Both building floor plans and mechanical plans, if available, shall be used during the inspection, cleaning and restoration work .

1.4 Appropriate Environmental Engineering

Controls: HVAC inspection activities may adversely influence a building’s indoor environment . Of primary concern is the disturbance of settled particulate and the potential for disturbed particles to be released into occupied areas . During an inspection, appropriate engineering controls shall be used to manage the general workspace environment .

1.5 Routine HVAC Inspection: It is recommended that

HVAC system inspections be part of a building’s overall energy and indoor air quality management plan, and that the inspections be addressed in accordance with documents such as ANSI/ASHRAE/ACCA Standard 180 Standard Practice for Inspection and Maintenance of Commercial Building HVAC Systems and NFPA 90-A Standard for the Installation of Air-Conditioning and Ventilating Systems Today.

1.5.1 Inspection Schedule Table

HVAC systems shall be routinely inspected for cleanliness by visual means . Table 1 provides a recommended inspection schedule for major HVAC components within different building use classifications . The inspection intervals specified in Table 1 are minimum recommendations

1.5.1.1 It is recommended that more

frequent cleanliness inspections be performed when geographical, human or mechanical conditions make it necessary .

Table 1 HVAC Cleanliness Inspection

Schedule(Recommended Intervals)

Building Use Classification

Air-handling

Unit

Supply Duct

Return Duct / Exhaust

Duct

Residential 1 year 2 years 2 years

Commercial 1 year 1 year 1 year

Industrial 1 year 1 year 1 year

Healthcare 1 year 1 year 1 year

Marine 1 year 2 years 2 years

1.6 HVAC System Inspection – Construction, Retrofit

and Remodel: HVAC system components often collect significant amounts of debris and particulate during construction activities within a building . It is recommended that new and existing HVAC systems that are part of a construction, retrofit or remodel project be inspected and verified as clean before the system is permitted to operate .

1.7 Performing HVAC System Component

Inspections: The cleanliness inspection shall include, at minimum, 10% of the HVAC system components .

If the inspection is being conducted as part of a mold remediation project in accordance with IICRC Standard S520, then all components of the HVAC system shall be inspected .

ACR The NADCA Standard • 20138

1.7.1 Air-Handling Unit Inspections: The air-

handling unit (AHU) cleanliness inspection shall include components within the unit, including filters and air bypass, heating and cooling coils, condensate pans, condensate drain lines, humidification systems, acoustic insulation, fans and fan compartments, dampers, door gaskets and general unit integrity . This would also include components such as fan coil units, evaporative coolers, etc .

1.7.2 Supply Air Duct Inspections: The supply

duct cleanliness inspection shall include supply components including, but not limited to, air ducts, controls, mixing/control boxes, reheat coils and other internal components .

1.7.3 Return Air Duct Inspections: The return

air duct cleanliness inspection shall include return components including, but not limited to, return air ducts, dampers, return plenums and grilles .

1.7.4 Exhaust Air Duct Inspections: General

exhaust, bathroom exhaust and heat recovery exhaust are considered part of the ventilation system and a part of the overall inspection .

1.7.5 Internal Components: Internal

components that are in the HVAC system air stream such as coils, dampers, fans, etc ., shall be inspected for cleanliness during the AHU or air duct inspection .

1.7.6 Damaged Components: Damaged

components observed during the inspection shall be documented .

1.8 Exposure to Hazardous Materials: If the possibility

exists that the inspector or others may be exposed to hazardous materials, consultation with a qualified indoor environmental professional (IEP) or other health and safety professional is recommended .

1.9 Inspecting for Mold Contamination: It is

recommended that the HVAC system cleanliness inspection include a preliminary determination of the level of suspect mold contamination (Condition 1, 2 or 3) and other biological activity . In the event suspect mold growth or other biological activity is identified, it is recommended that the cause and extent be further assessed, if necessary, by an indoor environmental professional (IEP) or other appropriate professional, or as required by Authorities Having Jurisdiction (AHJ) .

1.9.1 If the inspection of an HVAC unit’s air-

handling components reveals suspect mold contamination, then the supply and return ducts shall be inspected during that same inspection time rather than in accordance with the intervals specified in Table 1 .

1.9.2 If water damage or suspect mold growth

is observed on building products or furnishings, this condition is not within the scope of this document . Refer to IICRC S520 and/or Authorities Having Jurisdiction .

1.10 System Assessment: Information collected

from the HVAC inspection shall be documented and evaluated to assess the condition of the HVAC system at the time of the inspection . The assessment shall include a recommendation on the need for cleaning, a clearly defined scope of work for the cleaning and restoration project, recommended cleaning techniques, a determination of the environmental engineering controls required for the workspace, and any unique requirements .

ACR The NADCA Standard • 2013 9

Section 2 – Work Plans

2.0 Overview: A written work plan is a document

that communicates responsibilities and specific tasks associated with the cleaning and restoration project .

The work plan is created using information gathered from the HVAC inspection and system assessment .

2.1 Purpose: The primary purpose for providing a

written work plan is to allow the client, the cleaning contractor, field personnel and others involved in the project to have a clear understanding of what work tasks and procedures will be performed .

2.2 Scope of Work: A scope of work shall be included

that clearly identifies which HVAC components are to be cleaned or restored, as well as those components NOT included in the process . The scope of work shall also include the environmental engineering controls required for the workspace, and any unique requirements .

2.3 Means and Methods: It is recommended that

the written work plan identify the specific means and methods of cleaning and restoration that will be used for the particular project .

2.4 Other Trades and Their Tasks: When applicable, it

is recommended that the work plan include the name of all firms, contractors and representatives involved in the project, along with contact information . It is recommended that the tasks others will perform be clearly identified .

2.5 Project Schedule: When appropriate, it is

recommended that the work plan include the dates and times the work will take place and an overall timeframe for completion .

2.6 Work Site Communication Plan: When more

than one company is associated with the project, it is recommended that the written work plan list the name, company name and contact information of pertinent individuals, along with their responsibilities to the project .

2.7 Product Submittals: All general use and/or

specific “chemical type” products and coatings specific to the project shall be clearly listed on the work plan .

Additionally, the manufacturer’s instructions for use and application shall be available at all times for workers and others .

2.7.1 Material Safety Data Sheets (Includes

MSDS and SDS): The work plan shall include Material Safety Data Sheets for all chemical products to be used on the project . In addition, the MSDS shall be maintained on-site and available for review for the duration of the project . Documentation showing that the products have been submitted to the owner for review can also be included in the work plan .

2.7.2 Controlling Vapors and Odors: Where

applicable, the plan shall include a description of Engineering Controls (see Section 3) to be employed to control occupant and worker exposure to chemical vapors and odors .

2.8 Safety Plan & Safety Concerns: When life safety

detection equipment (e .g ., air duct sensors and smoke detectors) needs to be off-line or disabled, the work plan shall address life safety concerns, which will likely require the input of others . It is recommended that the written work plan define the responsibilities of each organization’s designated representative involved with executing the plan for the duration of the HVAC system cleaning and restoration project .

2.9 Disclaimers: It is recommended that the work plan

include disclaimers to clearly identify items that are not covered under any warranty or guarantee .

ACR The NADCA Standard • 201310

ACR The NADCA Standard • 2013 11

Section 3 - Engineering Controls for HVAC Cleaning and Restoration Projects

3.0 Overview: Engineering controls shall be used to

ensure worker safety and health, and to prevent cross-contamination . Engineering controls may include, but are not limited to source control, isolation barriers, pressure differentials, dust suppression methods, HEPA vacuuming and filtration, detailed cleaning, temperature and humidity control, and a sanitary approach .

3.1 Equipment Maintenance: All contractor equipment

shall be maintained in good working order, consistent with applicable jurisdictional requirements, including but not limited to vacuum collection equipment, power tools, pressurized air sources, electrical power cords and plugs, ground fault protection devices, vacuum collection hoses, fluid and pneumatic lines, manual and mechanical rotary brush systems, pneumatic cleaning systems, air duct zoning devices, ladders, staging equipment, and hand tools .

3.1.1 Equipment Maintenance Before

Project: Before any equipment is brought onto the work site it shall be cleaned and inspected to ensure that it will not introduce contaminants into the indoor environment or HVAC system .

3.1.2 Equipment Maintenance During a

Project: During a project all equipment shall be serviced as needed to limit possible cross-contamination from poor hygiene, and/ or unsafe operating conditions for service personnel and building occupants .

3.1.2.1 Collector Filter Maintenance

During a Project: Any activity requiring the opening of contaminated vacuum collection equipment on-site, such as servicing or filter maintenance shall be performed in an appropriate containment area or outside of the building .

3.1.3 Transportation and Relocation of

Equipment: All collection devices, vacuums and other tools and devices shall be cleaned or sealed before relocating to different areas of the building and before removing the equipment from building .

3.1.4 On-Site Equipment Verification: It is

recommended that an on-site maintenance verification be performed on vacuum collection equipment prior to commencement of work .

3.2 Fuel-powered Equipment: Generators, vacuum

trucks, air compressors or other fuel-powered equipment shall be positioned in a location to prevent combustion emissions and air exhaust emissions from entering an occupied space .

3.2.1 Location shall be monitored and managed

during a project to prevent the introduction of combustion emissions into the occupied space .

3.3 Vacuum Equipment Exhausting Indoors: When

using vacuum collection equipment exhausting within the building envelope, it shall utilize HEPA filtration with 99 .97% collection efficiency at 0 .3 micron particle size .

This requirement applies to all cleaning projects .

3.4 Negative Pressure Requirements: A continuous

negative pressure shall be maintained in the portion of the HVAC system being cleaned in relation to the surrounding indoor spaces . The negative pressure shall be verified at representative locations during the cleaning process .

3.5 Handling of Contaminated Materials: To prevent

cross-contamination, all contaminated materials removed from the HVAC system shall be properly contained prior to removal from the building .

3.5.1 Materials deemed to be hazardous by

governmental agencies shall be handled in strict accordance with any applicable local, regional or national codes .

3.6 Ambient Air Cleaning: It is recommended that

ambient air cleaning using HEPA-filtered air scrubbers be employed as a supplemental engineering control for particle reduction, during and immediately after HVAC cleaning and restoration work . It is recommended that ambient air cleaning provide a minimum of four (4) air changes per hour .

3.7 Control of Product Emissions: Any application

of cleaning agents or other chemicals shall be used in strict accordance with manufacturer’s recommended procedures and product application instructions, including exhaust ventilation as required .

3.8 Negative Pressure Failure: To prevent negative

pressure failure due to equipment malfunction or electrical power interruption, it is recommended that

ACR The NADCA Standard • 201312 backup equipment be on-site with a dedicated power supply properly designed to carry the intended current draw being utilized .

3.9 Level 1 Containment: Level 1 is the minimum level

of containment that shall be used on all HVAC system cleaning projects .

3.9.1 Negative Pressure: The HVAC system, or area being cleaned/restored, shall be placed under negative pressure during all cleaning activities . Negative pressure shall be sufficient to prevent migration of any particulate material out of the HVAC system .

3.9.2 Protective Coverings: Clean, protective

coverings shall be used within the work area .

Protective coverings shall extend beyond the work area to provide protection of flooring, equipment, and furniture whenever necessary .

3.9.3 Cleaning Equipment and Tools: All

tools and equipment shall be maintained as described in Section 3 .1 .

3.9.4 Cross-Contamination Control:

Engineering controls shall be in place to control contaminant discharge from the HVAC system and/or cross-contamination into occupied space during the cleaning process .

3.10 Level 2 Containment (Temporary Barriers):

3.10.1 Include Level 1 requirements: All level

1 containment requirements apply to Level 2 Containments

3.10.2 Temporary Containment Barriers:

Temporary barriers shall be constructed .

3.10.2.1 It is recommended that

containment barriers be erected from floor to ceiling when applicable .

3.10.2.2 It is recommended that above-

ceiling work areas are isolated from occupied spaces and/or non-work areas when applicable .

3.10.2.3 It is recommended that

containment barriers are built utilizing 6-mil fire retardant polyethylene sheeting or equivalent .

3.10.2.4 These barriers are

recommended to be sealed airtight where they meet the ceiling, floor, and walls or other areas .

3.10.3 Containment Area Floor: The

containment shall have a two-layer floor utilizing 6-mil fire retardant polyethylene or equivalent .

The floor material shall extend at least 6 inches (15 .2 centimeters) up the containment side walls . The floor material shall be sealed to side walls in a manner that will remain secure and airtight during the depressurization .

3.10.4 Containment Area Access: A zipper-

type access, with a single flap covering the zipper is the most common work practice .

3.10.4.1 In the event a zipper is not

available or practical, then a vertical cut in the containment side wall can provide access into the containment area . The vertical cut shall be entirely covered by two flaps, one on each side of the polyethylene .

3.10.5 Negative Pressure: The containment

area shall be kept under negative pressure at all times . The negative pressure shall be sufficient to prevent airborne migration of particulate material out of the containment area .

3.10.6 Validate Negative Pressurization: A

manometer or airflow measuring/monitoring device shall be used to validate negative pressurization .

3.10.7 Ambient Air Cleaning Ambient air

cleaning with HEPA-filtered air scrubbers shall be performed . Ambient air cleaning shall maintain, at minimum, four (4) air changes per hour .

3.10.8 Dismantling: Interior surfaces of the

containment enclosure shall be wet-wiped and/or HEPA vacuumed before moving or dismantling the containment enclosure . In the healthcare environment, an appropriate post-remediation verification shall be performed prior to dismantling the containment .

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3.11 Level 3 Containment: Level 3 is a containment

with a single chamber decontamination unit .

3.11.1 Include Level 1 and Level 2

Requirements: All of the Level 1 and 2 Containment requirements apply to Level 3 Containments . In addition, the following protective actions shall be used under Level 3 Containment strategies .

3.11.2 Decontamination Facility: A single

chamber decontamination facility shall be utilized in conjunction with the containment area . The decontamination chamber shall be attached and sealed directly to the containment area . The decontamination chamber shall be separated from the containment area by a zipper access with single flap or the use of two flaps as described in Level 2 Containment .

3.11.3 Monitoring Requirements: Level 3

Containment areas shall be monitored for negative pressure on a continuous basis by using an instrument sensitive enough to detect a loss of negative pressure . Background monitoring for total particulate shall be performed prior to set-up of containment to establish baseline airborne total particulate concentrations .

It is recommended that monitoring also be conducted during set-up of containment . Real time monitoring for total particulate shall be conducted on a regular basis during the work to ensure that particulate is not escaping the containment . If airborne particulate levels exceed background levels, work shall cease until airborne particulate levels are reduced to background levels and the cause of the problem is found and corrected .

3.12 Level 4 Containment: A Level 4 Containment is

a containment with a two chamber decontamination unit .

3.12.1 Include Level 1, Level 2 and Level 3

Requirements: All of the Level 1, Level 2, and Level 3 Containment requirements apply to Level 4 Containment areas . In addition, the following protective actions shall be used under Level 4 Containment strategies .

3.12.2 Decontamination Facility: A

decontamination facility as described for a Level 3 Containment area shall be utilized, except that the decontamination facility shall consist of two chambers . Each chamber shall be constructed according to the requirements described for a Level 3 Containment area .

3.12.3 Monitoring Requirements: Monitoring

requirements described for a Level 3 Containment area apply . In addition, the containment shall have a constant recording pressurization monitor with an appropriate alarm .

3.13 Summary of Engineering Controls: Appropriate

engineering controls are mandatory on every HVAC cleaning and restoration project . Protecting workers and building occupants and preventing cross-contamination shall be considered a priority on every project . It is recommended that the above listed engineering controls are considered minimum requirements . When a contractor has any questions about project-specific engineering controls, it is recommended that an Indoor Environmental Professional (IEP) be consulted .

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Section 4 - Cleaning and Restoration Procedures

4.0 Overview: All cleaning and restoration procedures

shall achieve the minimum level of visibly clean or the specified level of cleanliness verification as defined in the contractual documents for components within the project scope of work .

4.1 Negative Duct Pressurization: Prior to and

throughout the duration of the cleaning process, the HVAC system and associated air duct shall be kept at an appropriate negative pressure differential relative to the indoor non-work area . This negative pressure differential shall be maintained between the portion of the HVAC duct system being cleaned and surrounding indoor occupant spaces .

4.1.1 Verifying Negative Pressure

Differential: Under all circumstances, you shall verify pressurization differential during the project .

4.1.2 Equipment Exhausting Indoors:

When utilizing vacuum collection equipment exhausting indoors it shall be HEPA-filtered and be capable of retaining dislodged debris .

4.1.3 Equipment Exhausting Outdoors:

All equipment used to create negative duct pressurization that does not have HEPA filtration shall be exhausted outdoors .

4.2 Service Openings: Service openings may be needed

to perform assessment, cleaning and restoration (ACR) procedures . Below are the minimum requirements for service openings .

4.2.1 Service openings installed into the system

shall not degrade the structural, thermal, or functional integrity of the system .

4.2.2 Service openings shall be created in a

manner that allows for proper closure .

4.2.3 Service openings shall not hinder, restrict, or alter the airflow within the air duct .

4.2.4 Service opening construction materials

and methods shall be in compliance with industry standards and local codes, using materials acceptable under those standards and codes .

4.2.5 Materials used in the fabrication of duct

access doors and permanent panels shall be those classified for flammability and smoke spread if the material is exposed to the internal airstream . These materials are classified as having a flame-spread rating of not over 25 without evidence of continued progressive combustion and a smoke-developed rating of not over 50, as determined by UL 723.

4.2.6 All tapes used in the installation and

closure of service openings shall meet the requirements of UL 181A.

4.2.7 All service openings shall comply with

applicable UL, SMACNA and NFPA standards, as well as local, regional, and state codes .

4.2.8 Service Panels

4.2.8.1 Service panels used for closing

service openings in the HVAC system shall be of an equivalent gauge or heavier so as to not compromise the structural integrity of the duct .

4.2.8.2 Service panels used for closing

service openings shall be mechanically fastened (screwed or riveted) at minimum every 4” on center . The panel shall overlap the ductwork surfaces by a minimum of 1” on all sides .

4.2.8.3 It is recommended that service

panels used for closing service openings be sealed with gaskets, duct sealants, mastic or tape .

4.2.9 Prefabricated Duct Access Doors: The

gauge of the duct access door shall be based on the pressure class of the duct system and shall be installed according to manufacturers specifications .

4.2.10 Fibrous Glass System Service

Openings

4.2.10.1 Access and closure of service

openings installed in fibrous glass shall be created and closed in such a manner that there are no exposed fibrous glass edges within the system common to the airstream .

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4.2.10.2 Any fibrous glass removed

during the installation of a service opening shall be repaired or replaced with like material of the same thickness so that there are no breaks or openings that would degrade the R value, service rating or vapor/air barrier characteristics .

4.2.11 Drilled 1” Service Openings: Drilled 1”

service openings shall be closed with materials meeting UL 181 for smoke generation and flame spread .

4.2.12 Flexible Duct Systems: Service

openings shall not be made in flexible ductwork .

4.3 Cleaning and Restoration of HVAC Systems:

HVAC systems shall be cleaned by using a suitable agitation device to dislodge contaminants from the HVAC component surface and then capturing the contaminants with a vacuum collection device .

4.4 Wet Cleaning, Power Washing, and Steam

Cleaning: Wet cleaning, power washing, steam cleaning and any other form of wet process cleaning of HVAC system components shall not damage or result in subsequent damage to the components . Cleaning agents or water shall never be applied to electrical, fibrous glass or other porous HVAC system components .

4.5 Vacuum Collection Equipment: Vacuum

collection equipment shall be operated continuously during cleaning . The collection equipment shall be used in conjunction with agitation tools and other equipment to convey and collect debris and prevent cross-contamination of dislodged particulate during the mechanical cleaning process .

4.5.1 Capture Velocity: When the vacuum

collection device is used to convey air with debris, it shall maintain a sufficient velocity and negative pressure differential in the portion of the mechanical system being cleaned . Table 2 defines recommended velocities for various types of contaminants .

Table 2 Table of Velocity Requirements for

Contaminant Removal

Nature of Contaminant Examples

Design Velocity in

FPM

Very fine light dust

Cotton lint, wood flour, litho powder

2500-3000

Dry dusts & powders

Fine rubber dust, Bakelite molding powder dust, jute lint, cotton dust, shavings (light), soap dust, leather shavings

3000-4000

Average industrial dust

Grinding dust, buffing lint (dry), wool jute dust, shoe dust, granite dust, silica flour, general material handling, brick cutting, clay dust, foundry (general), limestone dust, packaging and weighing asbestos dust in textile industries

3500-4000

Heavy dusts Sawdust (heavy & wet), metal turnings, foundry tumbling barrels and shake out, sand blast dust, wood blocks, hog waste, brass turnings, cast iron boring dust, lead dust

4000-4500

Reprinted from ACGIH Industrial Ventilation:

A Manual of Recommended Practice

4.6 Confined Space Cleaning: When working inside a

confined space, health and safety concerns shall be a priority . The duct support system, internal components, configuration and confined space concerns shall be evaluated for safety prior to entry . It is recommended that a Certified Safety Professional be consulted as needed .

4.7 Air-Handling Unit (AHU) Cleaning: It is

recommended that air-handling coils, fans, condensate pans, drains and similar non-porous surfaces be wet cleaned in conjunction with mechanical methods .

4.7.1 Efforts to control water extraction

shall be sufficient to collect debris and prevent water damage to the HVAC components and surrounding equipment and structure .

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4.7.2 The capture, containment, testing

and disposal of waste water generated while performing wet cleaning shall be in accordance with applicable local, regional, state and federal regulations .

4.8 Air Duct Cleaning: Air ducts shall be cleaned

to remove all non-adhered substances and shall be capable of passing NADCA cleanliness verification tests .

4.8.1 Air ducts shall be accessed through service

openings in the system that are large enough to accommodate mechanical cleaning procedures and allow for cleanliness verification .

4.8.2 Air ducts shall be cleaned using

mechanical agitation methods to remove particulate, debris, and surface contamination .

4.8.3 Dislodged substances shall be captured

with a vacuum collection device .

4.8.4 Cleaning activities shall not damage any

HVAC components .

4.9 Dampers: Dampers and any air-directional

mechanical devices shall have their position marked prior to cleaning and shall be restored to their marked position after cleaning .

4.10 Registers, Grilles, Diffusers: It is recommended

that all registers, grilles, diffusers and other air distribution devices be removed if possible, properly cleaned, and shall be restored to their previous position .

4.11 Smoke and/or Fire Detection Equipment:

Cleaning activities shall not impair, alter or damage any smoke and fire detection equipment located within the facility, or attached to and serving the HVAC system .

4.12 Coil Surface Cleaning: When coil cleaning is

performed, both upstream and downstream sides of each coil section shall be accessed for cleaning . When both sides of a coil are not accessible for cleaning then removal and/or replacement may be required .

4.12.1 Preliminary Coil Inspection: A visual

inspection of the coil and drain pan shall be conducted prior to cleaning a coil . The data gathered from the preliminary inspection will determine whether Type 1 or Type 2 cleaning is required .

4.12.1.1 If it is determined the coil

cannot be properly cleaned through Type 1 methods, Type 2 methods shall be performed .

4.12.1.2 When the preliminary visual

inspection reveals suspect microbial matter on any portion of the coil or drain pan, Type 2 cleaning methods shall be performed .

4.12.1.3 When the metal fins of the coil

are damaged, deteriorating or showing signs of corrosion, replacement may be necessary . If cleaning will result in further damage to the coil, replacement is recommended .

4.12.2 Type 1 Coil Cleaning (Dry Cleaning):

Type 1 methods of coil cleaning shall be used for removing loose dust, dirt or debris collected upon coil surfaces . Negative air machines shall be operated continuously during Type 1 coil cleaning process . The coil shall be isolated from the duct system during the cleaning process to ensure disrupted particulate does not migrate to, or redeposit on, unintended areas . Physical removal of debris may be accomplished through a variety of methods which may include:

· HEPA-filtered contact vacuuming

· Brushes for penetrating between coil fins

4.12.3 Type 1 Post-Cleaning Inspection: This

inspection shall be performed after Type 1 coil cleaning has been completed . If debris still remains on the coil or the coil is impacted, Type 2 cleaning shall be performed .

4.12.4 Type 2 Coil Cleaning (Wet Cleaning):

Type 2 cleaning methods are appropriate for removing adhered debris on all coil, drain pan and drain line surfaces . Type 2 cleaning shall be performed after non-adhered substance has been removed using Type 1 methods . Type 2 cleaning may include the following methods:

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products (which shall be used in accordance with the manufacturer’s product labeling)

· Water washing at normal water line pressure

equipment

4.12.4.1 The condensate drain pan and

drain line shall be cleaned and flushed .

The condensate drain pan shall be inspected to verify proper drainage operation before and after cleaning .

4.12.4.2 Cleaning methods and

products shall not cause damage to, or erosion of, the coil surface or fins and shall conform to coil manufacturer recommendations when available . It is recommended that only coil cleaning solutions that are as close to pH neutral as possible are used .

4.12.5 Type 2 Post-Cleaning Inspection:

Type 2 inspections shall be conducted after completion of Type 2 cleaning methods . If debris still remains on the coil after Type 2 cleaning, the process shall be repeated . When debris cannot be removed using Type 2 cleaning methods, replacement may be necessary .

4.12.6 Measuring the Effectiveness of Coil

Cleaning: Visual observation of coil surfaces can be misleading, therefore it is recommended that a static pressure drop measurement be obtained before…