Attachment 2. MAHG231012 Clean Ductwork _Appx A-CLEANING SPEC.pdf

SOW Appendix A MAHG231012, Trent Lott Hall B2603, Duct Cleaning

DUCT CLEANING SPECIFICATION

This specification is derived from UFGS 23 01 30 for MAHG231012 Trent Lott Hall, B2603, Duct Cleaning Project.

Contractor shall accomplish duct cleaning work per National Air Duct Cleaners Association guidelines given within the following documents:

a. NADCA Standard for Assessment, Cleaning, and Restoration of HVAC Systems

b. NADCA HVAC Inspection Manual (2016)

The duct cleaning work shall be accomplished in three phases, 1st floor HVAC systems, 2nd floor HVAC systems, and finally HIGH BAY, SIMULATOR AREA HVAC systems.

The 1st floor HVAC system cleaning work will include AHU‐1 and its PH, CLG coils; and the approx.

30 VAV boxes and their RH coils, separate RH coil #3; the associated rigid rectangular ductwork, the dual RA opening, flexible duct work, and the 4‐way square SA diffuser terminals, and all RA ceiling grilles. Also, on the 1st floor are EF‐1 & EF‐2 restrooms and their associated duct systems, exhaust registers.

Finally, these 1st floor HVAC systems will be balance tested together to confirm proper positive building pressurization.

Similarly, the 2nd floor HVAC system cleaning work will include AHU‐2 and its PH, CLG coils; and the approx. 16 VAV boxes and their RH coils, separate RH coils #1, #2, #4; the associated rigid rectangular ductwork, the single RA opening, flexible duct work, the 4‐way square SA diffuser terminals, and all RA ceiling grilles, including RA ductwork with recently installed TF‐1.

Also, on the 2nd floor is EF‐5 @ Janitors Closet, EF‐3 & EF‐4 @ restrooms and their associated duct system, exhaust registers.

Finally, these 2nd floor HVAC systems will be balance tested together to confirm proper balance and positive building pressurization.

Similarly, the HIGH BAY, SIMULATOR AREA HVAC system cleaning work will include AHU‐3 and its PH, CLG, and RH coils; and the associated rigid rectangular ductwork, the single RA opening, and the side‐wall SA register terminals.

Also, on the 2nd floor is EF‐3 restroom exhaust and its associated duct system, exhaust registers. Finally, this HIGH BAY, SIMULATOR AREA HVAC system will be balance tested to confirm proper balance and positive building pressurization.

Assume 20% of flexible ductwork is damaged and requires replacement.

Definition of HVAC System HVAC system includes any interior surface of the facility's air distribution system for conditioned spaces and/or occupied zones. This includes the entire heating, air‐conditioning and ventilation system from the points where the air enters the system to the points where the air is discharged from the system. The return air grilles, return air ducts (except ceiling plenums and mechanical room) to the air handling unit (AHU), the interior surfaces of the AHU, mixing box, coil compartment, condensate drain pans, humidifiers and dehumidifiers, supply air ducts, fans, fan housing, fan blades, air wash systems, spray eliminators, turning vanes, filters, filter housings, reheat coils, and supply diffusers are all considered part of the HVAC system. The HVAC system may also include other components such as dedicated exhaust and ventilation components and make‐up air systems.

FA301024R0010

Attachment 2.

MAHG231012, Trent Lott Hall B2603, Duct Cleaning

DUCT CLEANING SPECIFICATION

Contractor shall maintain a copy of all current Safety Data Sheet (SDS) documentation and safety certifications on site at all times.

Submit all Safety Data Sheets (SDS) for all chemical products proposed used in the cleaning process, including all VOC ratings.

Contractor shall comply with all applicable Federal, State, and local requirements and codes for protecting the safety of the contractors' employees, building occupants, and the environment.

In particular, follow all applicable standards of the Occupational Safety and Health Administration (OSHA) when working in accordance with this specification.

Dispose of all debris removed from the HVAC System in accordance with applicable Federal, State and local requirements.

Work Execution Schedule Contractor shall conduct a site evaluation, and establish a specific, coordination plan which details how each area of the building is protected during the various phases of the project. Include this coordination plan with a “Work Execution Schedule” Submit this “Work Execution Schedule” within 10 working days of the contract award.

Record of Existing Conditions Perform a visual inspection of the HVAC system, coordinated with the Contracting Officer, to determine appropriate methods, tools, and equipment required to satisfactorily complete this project. Document damaged system components found during the inspection.

Submit "Record of Existing Conditions” to the Contracting Officer prior to the start of any cleaning work.

Post‐Project Report At the conclusion of the project, submit a Testing Procedures Summary and Post‐Project Report indicating success of the cleaning project, as verified through visual inspection and/or gravimetric analysis. List also areas of the system found to be damaged and/or in need of repair.

General HVAC System Cleaning Requirements

Containment Collect debris removed during cleaning and take precautions to ensure that debris is not otherwise dispersed outside the HVAC system during the cleaning process.

Particulate Collection Where the Particulate Collection Equipment (PCE) is exhausting inside the building, use HEPA filtration with 99.97 percent collection efficiency for 0.3‐micron size (or greater).

When the PCE is exhausting outside the building, undertake mechanical cleaning operations only with PCE, including adequate filtration to contain debris removed from the HVAC system. When the PCE is exhausting outside the building, take precautions to locate the equipment down wind and away from all air intakes and other points of entry into the building.

DUCT CLEANING SPECIFICATION

Controlling Odors Take all reasonable measures to control offensive odors and/or mist vapors during the cleaning process.

Component Cleaning Employ cleaning methods such that all HVAC system components are Visibly Clean as defined in applicable standards. Upon completion, return all components to those settings recorded just prior to cleaning operations.

Air‐Volume Control Devices Mark the position of dampers and any air‐directional mechanical devices inside the HVAC system prior to cleaning and, upon completion, restore to their marked position.

Service Openings Utilize service openings, as required for proper cleaning, at various points of the HVAC system for physical and mechanical entry, and inspection. Utilize the existing service openings already installed in the HVAC system where possible.

Create other openings where needed in conformance with NADCA Standard 05. Place closures so they do not significantly hinder, restrict, alter the air‐flow within the system, or compromise the structural integrity of the system. Properly insulate closures to prevent heat loss/gain or condensation on surfaces within the system. Conform construction techniques used in the creation of openings to requirements of applicable building and fire codes, and applicable NFPA, SMACNA and NADCA Standards.

Cutting service openings into flexible duct is not permitted. Disconnect flexible duct at the ends as needed for proper cleaning and inspection.

Reseal rigid fiber glass duct‐board duct systems in accordance with NAIMA recommended practices;

NAIMA AH112, NAIMA AH122, and NAIMA AH127.

Only closure techniques which comply with UL 181, UL 181A, or UL 181B are suitable for fiber glass duct system closures.

Clearly mark all service openings, capable of being re‐opened for future inspection or remediation, and report their location in project report documents.

Ceiling Sections (Tile) Carefully remove and reinstall ceiling sections to gain access to HVAC systems during the cleaning process. Replace any existing damaged ceiling sections, and replace any ceiling section damages caused by this duct cleaning work up to 20% of ceiling. Other damage exceeding this 20% limit shall be replaced at no cost to the Government. (See SOW Section 3.2.4.6)

Air Distribution Devices (Registers, Grilles and Diffusers) Clean all air distribution terminal inlet, outlet devices.

DUCT CLEANING SPECIFICATION

Air Handling Units, Terminal Units, Blowers and Exhaust Fans Ensure that supply, return, and exhaust fans and blowers are thoroughly cleaned.

Areas for cleaning include blowers, fan housings, plenums (except ceiling supply and return plenums), scrolls, blades, or vanes, shafts, baffles, dampers and drive assemblies. Remove all visible surface contamination deposits in accordance with NADCA Standards.

a. Clean all air handling unit (AHU) internal surfaces, components and condensate collectors and drains.

b. Assure that a suitable operative drainage system is in place prior to beginning wash down procedures.

c. Clean all coils and related components, including evaporator fins.

Duct Systems

a. Create service openings in the system as necessary in order to accommodate cleaning of otherwise inaccessible areas.

b. Mechanically clean all duct systems to remove all visible contaminants, such that the systems are capable of passing NADCA Cleaning Verification Testing Standards.

Mechanical Cleaning Methodology

Source Removal Cleaning Methods Clean the HVAC system using Source Removal mechanical cleaning methods designed to extract contaminants from within the HVAC system and safely remove contaminants from the facility.

Select Source Removal methods which will render the HVAC System Visibly Clean and capable of passing NADCA cleaning verification methods Standards and other specified standards and tests, in accordance with all general requirements.

Use no cleaning method, or combination of methods, which could potentially damage components of the HVAC system or negatively alter the integrity of the system.

Incorporate the use of vacuum collection devices that are operated continuously during cleaning for all methods used. Connect a vacuum device to the downstream end of the section being cleaned through a predetermined opening. Use a vacuum collection device of sufficient power to render all areas being cleaned under negative pressure, such that containment of debris and the protection of the indoor environment is assured.

Equip all vacuum devices exhausting air inside the building, including hand‐held vacuums and Wet vacuums, with HEPA filters (minimum efficiency).

Equip all vacuum devices exhausting air outside the facility with Particulate Collection including adequate filtration to contain Debris removed from the HVAC system, in a manner that does not allow contaminants to re‐enter the facility. Release of debris outdoors which violates any outdoor environmental standards, codes or regulations is not allowed.

All methods require mechanical agitation devices to dislodge debris adhered to interior HVAC system surfaces, such that debris may be safely conveyed to vacuum collection devices. Acceptable methods include those which will not potentially damage the integrity of the ductwork, nor damage porous surface materials such as liners inside the ductwork or system components.

Methods of Cleaning Fibrous Glass Insulated Components Thoroughly clean thermal & acoustic insulation elements present in any equipment or ductwork with HEPA vacuuming equipment. Clean while the HVAC system is under constant negative pressure, and not permitted to get wet in accordance with applicable NADCA and NAIMA standards and recommendations.

Do not use cleaning methods that cause damage to fibrous glass components or renders the system capable of passing Cleaning Verification Tests NADCA Standards.

Damaged Fibrous Glass Material If there is any evidence of damage, deterioration, delamination, friable material, mold or fungus growth, or moisture such that fibrous glass materials cannot be restored by cleaning or resurfacing with an acceptable insulation repair coating, identify them to the Contracting Officer for replacement.

When requested or specified, remediate exposed damaged insulation in air handlers and/or ductwork requiring replacement.

Replacement Material If replacement of fiber glass materials is required, conform all materials to applicable industry codes and standards, including those of UL and SMACNA 1966.

Replacement of damaged insulation is not covered by this specification.

Cleaning of Coils Use any cleaning method which renders the coil visibly clean and capable of passing NADCA Coil Cleaning Verification Standards. Coil drain pans are subject to Non‐Porous Surfaces Cleaning Verification.

Maintain operability of the drain for the condensate at all times. Do not damage, displace, inhibit heat transfer, or cause erosion of the coil surface or fins, and conform to coil manufacturer recommendations when available.

Thoroughly rinse coils with clean water to remove any latent residues.

Antimicrobial Agents and Coatings Only apply antimicrobial agents if active fungal growth is reasonably suspected, or where unacceptable levels of fungal contamination have been verified through testing.

Perform application of any antimicrobial agents used to control the growth of fungal or bacteriological contaminants after the removal of surface deposits and debris.

Use only antimicrobial agents registered by the U.S. Environmental Protection Agency (EPA 402‐F‐91‐102)(EPA 402‐C‐01‐001) specifically for use within HVAC system.

Apply antimicrobial agents in strict accordance with manufacturer's instructions.

Use only antimicrobial coating products, for both porous and non‐porous surfaces which are EPA registered, water soluble solutions with supporting efficacy data and SDS records.

Apply antimicrobial coatings according to manufacturer's instructions. Spray coatings directly onto interior ductwork surfaces, rather than "fog" downstream onto surfaces. Achieve a continuous film on the surface treated by the coating application, and apply in strict accordance with manufacturer's minimum millage surface application rate standards for effectiveness.

FIELD QUALITY CONTROL

Cleanliness Verification Verification of HVAC System cleanliness is determined after mechanical cleaning and before the application of any treatment or introduction of any treatment‐related substance to the HVAC system, including antimicrobial agents and coatings.

Visual Inspection Visually inspect the HVAC system to ensure that no visible contaminants are present.

If no contaminants are evident through visual inspection, consider the HVAC system clean; however, further verification of the system cleanliness through gravimetric or wipe testing analysis testing may be requested at the discretion of the Contracting Officer.

If visible contaminants are evident through visual inspection, re‐clean those portions of the system where contaminants are visible, and subject to re‐inspection for cleanliness.

Gravimetric Analysis At the expense of the Contractor, test sections of the HVAC system for cleanliness using the NADCA Vacuum Test (gravimetric analysis) as specified in applicable NADCA Standards. Ensure levels of debris collected are equal to or less than acceptable levels defined in applicable NADCA Standards.

If gravimetric analysis determines that levels of debris are equal to or lower than those levels specified, the system is considered clean and to have passed cleanliness verification.

If gravimetric analysis determines that levels of debris exceed those specified in applicable NADCA standards, the system will not be considered clean, and re‐cleaning of those sections of the system which failed cleanliness verification will be required at the expense of the HVAC system cleaning contractor.

Perform cleanliness verification immediately after mechanical cleaning and before the HVAC system is restored to normal operation.

Verification of Coil Cleaning Cleaning is to restore the coil pressure drop to within 10 percent of the pressure drop measured when the coil was first installed. If the original pressure drop is not known, the coil will be considered clean only if the coil is free of foreign matter and chemical residue, based on a thorough visual inspection (see NADCA HVAC Inspection Manual Standards).