23 00 00 - Air Supply Distribution Ventilation and Exhaust Systems.pdf

KRSM 072115 Catwalks to Overhead HVAC, Building 238 Hill AFB, Utah

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-1

SECTION TABLE OF CONTENTS

DIVISION 23 - HEATING, VENTILATING, AND AIR CONDITIONING

SECTION 23 00 00

AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS

11/08

PART 1 GENERAL

1.1 REFERENCES

1.2 SYSTEM DESCRIPTION

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.4.1 Prevention of Corrosion

1.4.2 Asbestos Prohibition

1.4.3 Use of Ozone Depleting Substances, Other than Refigerants

1.4.4 Detail Drawings

1.5 DELIVERY, STORAGE, AND HANDLING

PART 2 PRODUCTS

2.1 STANDARD PRODUCTS

2.2 SEISMIC ANCHORAGE

2.3 INDOOR AIR QUALITY

2.4 DUCT SYSTEMS

2.4.1 Metal Ductwork

2.4.1.1 Insulated Nonmetallic Flexible Duct Runouts

2.4.1.2 General Service Duct Connectors

2.4.2 Ductwork Accessories

2.4.2.1 Manual Balancing Dampers

2.4.2.2 Air Deflectors and Branch Connections

2.4.3 Diffusers and Grilles

2.4.3.1 Diffusers

2.4.4 Air Filters

2.4.4.1 Extended Surface Pleated Panel Filters

PART 3 EXECUTION

3.1 FIELD MEASUREMENTS

3.2 INSTALLATION

3.2.1 Flexible Duct

3.2.2 Metal Ductwork

3.2.3 Dust Control

3.2.4 Insulation

3.2.5 Duct Test Holes

3.3 CUTTING AND PATCHING

3.4 CLEANING

3.5 PENETRATIONS

3.6 TESTING, ADJUSTING, AND BALANCING

3.7 PERFORMANCE TESTS

3.8 CLEANING AND ADJUSTING

3.9 OPERATION AND MAINTENANCE TRAINING

-- End of Section Table of Contents –

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-2

SECTION 23 00 00

AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS

11/08

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 52.2 (2007; Addenda B 2008; Errata 2009) Method of Testing General Ventilation

Air-Cleaning Devices for Removal Efficiency by Particle Size

ASHRAE 62.1 (2007; INT 2007; INT 2-15 2008; Errata 2008; Addenda a, b, e, f and h 2008) Ventilation for Acceptable Indoor Air Quality

ASHRAE 70 (2006) Method of Testing for Rating the Performance of Air Outlets and Inlets

ASTM INTERNATIONAL (ASTM)

ASTM A 123/A 123M (2008) Standard specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM B766 (1986; R 2008) Standard Specification for Electrodeposited Coating or Cadmium

SHEET METAL AND AIR CONDITIONING CONTRACTORS’ NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1966 (2005) HVAC Duct Construction Standards Metal and Flexible

UNDERWRITERS LABORATORIES (UL)

UL 181 (2005; Rev thru Oct 2008) Standard for Factory-Made Air Ducts and Air Connectors

UL 214 (1997; Rev thru Aug 2001) Tests for Flame-Propagation of Fabrics and Films

UL 6 (2007) Standard for Electrical Rigid Metal Conduit-Steel

UL Bld Mat Dir (2009) Building Materials Directory

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-3

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 90A (2008) Standard for the Installation of Air Conditioning and Ventilating Systems

1.2 SYSTEM DESCRIPTION

Furnish ductwork, piping offsets, fittings, and accessories as required to provide a complete installation.

Coordinate the work of the different trades to avoid interference between piping, equipment, structural, and electrical work. Provide complete,in place, all necessary offsets in piping and ductwork, and all fittings, and other components, required to install the work as indicated and specified.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

SD-02 Shop Drawings

Detail Drawings; G

Drawings as specified in Paragraph Detail Drawings and throughout this Section.

SD-03 Product Data Standard

Manufacturer's catalog data included with the detail drawings for the following items. Highlight the data to show model, size, options, etc., that are intended for consideration. Provide adequate data to demonstrate compliance with contract requirements for the following:

Insulated Nonmetallic Flexible Duct Runouts Duct Connectors Duct Access Doors Manual Balancing Dampers Diffusers Registers and Grilles Operation and Maintenance Training Proposed On-site Training schedule, submitted concurrently with the Operation and Maintenance Manuals.

SD-06 Test Reports

Performance Tests; G

Test reports for the performance tests in booklet form, upon completion of testing. Document phases of tes ts performed including ini t ia l tes t summary, repairs/adjustments made, and final test results in the reports.

SD-08 Manufacturer's Instructions

Manufacturer's Installation Instructions Operation and Maintenance Training

1.4 QUALITY ASSURANCE

Except as otherwise specified, approval of materials and equipment is based on manufacturer's published data.

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-4

a. Where materials and equipment are specified to conform to the standards of the Underwriters Laboratories, the label of or listing with reexamination in UL Bld Mat Dir, and UL 6 is acceptable as sufficient evidence that the items conform to Underwriters Laboratories requirements.

In lieu of such label or listing, submit a written certificate from any nationally recognized testing agency, adequately equipped and competent to perform such services, stating that the items have been tes ted and that the units conform to the specif ied requirements. Outline methods of testing used by the specified agencies.

b. Where materials or equipment are specified to be constructed or tested, or both, in accordance with the standards of the ASTM International (ASTM), the ASME International (ASME), or other standards, a manufacturer's certificate of compliance of each item is acceptable as proof of compliance.

c. Conformance to such agency requirements does not relieve the item from compliance with other requirements of these specifications.

1.4.1 Prevention of Corrosion

Protect metallic materials against corrosion. Manufacturer shall provide rust-inhibiting treatment and standard finish for the equipment enclosures. Do not use aluminum in contact with earth, and where connected to dissimilar metal. Protect aluminum by approved fittings, barrier material, or treatment. Ferrous parts such as anchors, bolts, braces, boxes, bodies, clamps, fittings, guards, nuts, pins, rods, shims, thimbles, washers, and miscellaneous parts not of corrosion-resistant steel or nonferrous materials shall be hot-dip galvanized in accordance with ASTM A 123/A 123M for exterior locations and cadmium-plated in conformance with ASTM B 766 for interior locations.

1.4.2 Asbestos Prohibition

Do not use asbestos and asbestos-containing products.

1.4.3 Use of Ozone Depleting Substances, Other than Refigerants

The use of Class I or Class II ODS's listed as nonessential in 40 CFR 82 Part 82.66 Subpart C is prohibited. These prohibited materials and uses include:

a. Any plastic party spray streamer or noise horn which is propelled by a chlorofluorocarbon

b. Any cleaning fluid for electronic and photographic equipment which contains a chlorofluorocarbon; including liquid packaging, solvent wipes, solvent sprays, and gas sprays

c. Any plastic flexible or packaging foam product which is manufactured with or contains a chlorofluorocarbon, including, open cell foam, open cell rigid polyurethane poured foam, closed cell extruded polystyrene sheet foam, closed cell polyethylene foam and closed cell polypropylene foam except for flexible or packaging foam used in coaxial

d. Any aerosol product or other pressurized dispenser which contains a chlorofluorocarbon, except for those listed in 40 CFR 82 Part 82.66 Subpart C.

Request a waiver if a facility requirement dictates that a prohibited material is necessary to achieve project goals. Submit the waiver request in writing to the Contracting Officer. The waiver will be evaluated and dispositioned.

1.4.4 Detail Drawings

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-5

Submit detail drawings showing equipment layout, including assembly and installation details and electrical connection diagrams; ductwork layout showing the location of all supports and hangers, typical hanger details, gauge reinforcement, reinforcement spacing rigidity classification, and static pressure and seal classifications. Include any information required to demonstrate that the system has been coordinated and functions properly as a unit on the drawings and show equipment relationship to other parts of the work, including clearances required for operation and maintenance. Submit drawings showing bolt-setting information, and foundation bolts prior to concrete foundation construction for all equipment indicated or required to have concrete foundations. Submit function designation of the equipment and any other requirements specifed throughout this Section with the shop drawings

1.5 DELIVERY, STORAGE, AND HANDLING

Protect stored equipment at the jobsite from the weather, humidity and temperature variations, dirt and dust, or other contaminants. Additionally, cap or plug all pipes until installed.

PART 2 PRODUCTS

2.1 STANDARD PRODUCTS

Provide components and equipment that are "standard products" of a manufacturer regularly engaged in the manufacturing of products that are of a similar material, design and workmanship. "Standard products" is defined as being in satisfactory commercial or industrial use for 2 years before bid opening, including applications of components and equipment under similar circumstances and of similar size, satisfactorily completed by a product that is sold on the commercial market through advertisements, manufacturers' catalogs, or brochures. Products having less than a 2-year field service record are acceptable if a certified record of satisfactory f ie ld operat ion, for not less than 6000 hours exclusive of the manufacturer's factory tests, can be shown. Provide equipment items that are supported by a service organization. Where applicable, provide equipment that is an ENERGY STAR Qualified product or a Federal Energy Management Program (FEMP) designated product.

2.2 SEISMIC ANCHORAGE

Anchor equipment in accordance with applicable seismic criteria for the area and as defined in

SMACNA 1650

2.3 INDOOR AIR QUALITY

Provide equipment and components that comply with the requirements of ASHRAE 62.1 unless more stringent requirements are specified herein.

2.4 DUCT SYSTEMS

2.4.1 Metal Ductwork

Provide metal ductwork construction, including all fittings and components, that complies with SMACNA 1966 unless otherwise specified. Provide radius type elbows with a centerline radius of

1.5 times the width or diameter of the duct where space permits. Otherwise, elbows having a minimum radius equal to the width or diameter of the duct or square elbows with factory fabricated turning vanes are allowed. Provide ductwork that meets the requirements of Seal Class A.

Provide ductwork in VAV systems upstream of the VAV boxes that meets the requirements of Seal Class A. Provide sealants that conform to fire hazard classification specified in Section 23 07 00 THERMAL INSULATION FOR MECHANICAL SYSTEMS and are suitable for the range of air distribution and ambient temperatures to which it is exposed. Do not use pressure sensitive

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-6

tape as a sealant. Make spiral lock seam duct, and flat oval with duct sealant and lock with not less than 3 equally spaced drive screws or other approved methods indicated in SMACNA 1966. Apply the sealant to the exposed male part of the fitting collar so that the sealer is on the inside of the joint and fully protected by the metal of the duct fitting. Apply one brush coat of the sealant over the outside of the joint to at least 50 mm 2 inch band width covering all screw heads and joint gap. Dents in the male portion of the slip fitting collar are not acceptable.

2.4.1.1 Insulated Nonmetallic Flexible Duct Runouts

Use flexible duct runouts only where indicated. Runout length is indicated on the drawings, and is not to exceed 3 feet. Provide runouts that are preinsulated, factory fabricated, and that comply with NFPA 90A and UL 181. Provide either field or factory applied vapor barrier. Provide not less than 0.60 L 20 ounce glass fabric duct connectors coated on both sides with neoprene. Insulated flexible connectors are allowed as runouts. Provide insulated material and vapor barrier that conform to the requirements of Section 23 07 00 THERMAL INSULATION FOR MECHANICAL SYSTEMS. Do not expose the insulation material surface to the air stream.

2.4.1.2 General Service Duct Connectors

Provide a flexible duct connector approximately 150 mm 6 inches in width where sheet metal connections are made to fans or where ducts of dissimilar metals are connected. For round/oval ducts, secure the flexible material by stainless steel or zinc-coated, iron clinch-type draw bands. For rectangular ducts, install the flexible material locked to metal collars using normal duct construction methods. Provide a composite connector system that complies with UL 214 and is classified as "flame-retarded fabrics" in UL Bld Mat Dir.

2.4.2 Ductwork Accessories

2.4.2.1 Manual Balancing Dampers

Furnish manual balancing dampers with accessible operating mechanisms. Use chromium plated operators (with all exposed edges rounded) in finished portions of the building.

Provide manual volume control dampers that are operated by locking-type quadrant operators. Install dampers that are 2 gauges heavier than the duct in which installed.

Unless otherwise indicated, provide opposed blade type multileaf dampers with maximum blade width of 300 mm 12 inches. Provide access doors or panels for all concealed damper operators and locking setscrews. Provide stand-off mounting brackets, bases, or adapters not less than the thickness of the insulation when the locking-type quadrant operators for dampers are installed on ducts to be thermally insulated, to provide clearance between the duct surface and the operator. Stand-off mounting items shall be integral with the operator or standard accessory of the damper manufacturer.

2.4.2.2 Air Deflectors and Branch Connections

Provide 45 degree entry connections branch connections. Provide easily accessible means for adjustment inside the duct or from an adjustment with sturdy lock on the face of the duct. When installed on ducts to be thermally insulated, provide external adjustments with stand-off mounting brackets, integral with the adjustment device, to provide clearance between the duct surface and the adjustment device not less than the thickness of the thermal insulation. Make adjustment from the face of the diffuser or by position adjustment and lock external to the duct. Provide stand-off brackets on insulated ducts as described herein. Provide turning vanes. In 90 degree elbows.

2.4.3 Diffusers and Grilles

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-7

Provide factory-fabricated units of steel that distribute the specified quantity of air evenly over space intended without causing noticeable drafts, air movement faster than 0.25 m/s 50 fpm in occupied zone, or dead spots anywhere in the conditioned area. Provide outlets for diffusion, spread, throw, and noise level as required for specified performance. Certify performance according to ASHRAE 70. Provide sound rated and certified inlets and outlets according to ASHRAE 70. Provide diffusers with volume damper with accessible operator, unless otherwise indicated; or if standard with the manufacturer, an automatically controlled device is acceptable. Provide opposed blade type volume dampers for all diffusers.

2.4.3.1 Diffusers

Provide diffuser types indicated. Furnish ceiling mounted units with anti-smudge devices, unless the diffuser unit minimizes ceiling smudging through design features.

Provide diffusers with air deflectors of the type indicated. Install ceiling mounted units with rims tight against ceiling. Provide sponge rubber gaskets between ceiling and surface mounted diffusers for air leakage control. Provide suitable trim for flush mounted diffusers. For connecting the duct to diffuser, provide duct collar that is airtight and does not interfere with volume controller. Provide return units with perforated faces.

2.4.4 Air Filters

List air filters according to requirements of UL 900.

2.4.4.1 Extended Surface Pleated Panel Filters

Provide 4 inch depth, sectional, disposable type filters of the size indicated with a MERV of 14 when tested according to ASHRAE 52.2. Provide initial resistance at 500 fpm that does not exceed 0.65 inches water gauge. Provide UL Class 2 filters, and nonwoven cotton and synthetic fiber mat media. Attach a wire support grid bonded to the media to a moisture resistant fiberboard frame. Bond all four edges of the filter media to the inside of the frame to prevent air bypass and increase rigidity.

PART 3 EXECUTION

3.1 FIELD MEASUREMENTS

After becoming familiar with all details of the work, verify all dimensions in the field, and advise the Contracting Officer of any discrepancy before performing the work.

3.2 INSTALLATION

a. Install materials and equipment in accordance with the requirements of the contract drawings and approved manufacturer's installation instructions. Accomplish installation by workers skilled in this type of work. Perform installation so that there is no degradation of the designed fire ratings of walls, partitions, ceilings, and floors.

b. No installation is permitted to block or otherwise impede access to any existing machine or system.

3.2.1 Flexible Duct

Install pre-insulated flexible duct in accordance with the latest printed instructions of the manufacturer to ensure a vapor tight joint. Provide hangers, when required to suspend the duct, of the type recommended by the duct manufacturer and set at the intervals recommended.

3.2.2 Metal Ductwork

Install according to SMACNA 1966 unless otherwise indicated. Install duct supports

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-8

for sheet metal ductwork according to SMACNA 1966, unless otherwise specified. Do not use friction beam clamps indicated in SMACNA 1966. Erect supports on the risers that allow free vertical movement of the duct. Attach supports only to structural framing members and concrete slabs. Do not anchor supports to metal decking unless a means is provided and approved for preventing the anchor from puncturing the metal decking. Where supports are required between structural framing members, provide suitable intermediate metal framing.

Where C-clamps are used, provide retainer clips.

3.2.3 Dust Control

To prevent the accumulation of dust, debris and foreign material during construction, perform temporary dust control protection. Protect the distribution system (supply and return) with temporary seal-offs at all inlets and outlets at the end of each day's work.

Keep temporary protection in place until system is ready for startup.

3.2.4 Insulation

Provide thickness and application of insulation materials for ductwork, piping, and equipment according to Section 23 07 00 THERMAL INSULATION FOR MECHANICAL

SYSTEMS.

3.2.5 Duct Test Holes

Provide holes with closures or threaded holes with plugs in ducts and plenums as indicated or where necessary for the use of pitot tube in balancing the air system. Provide extensions, complete with cap or plug, where the ducts are insulated.

3.3 CUTTING AND PATCHING

Install work in such a manner and at such time that a minimum of cutting and patching of the building structure is required. Make holes in exposed locations, in or through existing floors, by drilling and smooth by sanding. Use of a jackhammer is permitted only where specifically approved. Make holes through masonry walls to accommodate sleeves with an iron pipe masonry core saw.

3.4 CLEANING

Thoroughly clean surfaces of piping and equipment that have become covered with dirt, plaster, or other material during handling and construction before such surfaces are prepared for final finish painting or are enclosed within the building structure. Before final acceptance, clean mechanical equipment, including piping, ducting, and fixtures, and free from dirt, grease, and finger marks. When the work area is in an occupied space such as a shop or office, protect all furniture and equipment from dirt and debris.

Incorporate housekeeping for field construction work which leaves all furniture and equipment in the affected area free of construction generated dust and debris; and, all floor surfaces vacuum-swept clean.

3.5 PENETRATIONS

a. Closure Collars: Provide closure collars of a minimum 100 mm 4 inches wide, unless otherwise indicated, for exposed ducts and items on each side of penetrated surface, except where equipment is installed. Install collar tight against the surface and fit snugly around the duct or insulation. Grind sharp edges smooth to prevent damage to penetrating surface. Fabricate collars for round ducts 380 mm 15 inches in diameter or less from 1 mm 20 gauge galvanized steel. Fabricate collars for square and rectangular ducts, or round ducts with minimum dimension over 380 mm 15 inches from 1.40 mm 18 gauge galvanized steel. Fabricate collars for square and rectangular ducts with a maximum side of 380 mm 15 inches or less from 1 mm 20 gauge galvanized steel. Install collars with fasteners a maximum of 150 mm 6 inches on center.

Attach to collars a minimum of 4 fasteners where the opening is 300 mm 12 inches in diameter or

AIR SUPPLY DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM 23 00 00-9

less, and a minimum of 8 fasteners where the opening is 500 mm 20 inches in diameter or less.

3.6 TESTING, ADJUSTING, AND BALANCING

The requirements for testing, adjusting, and balancing are specified in Section 23 05 93 TESTING, ADJUSTING AND BALANCING. Begin testing, adjusting, and balancing only when the air supply and distribution, including controls, has been completed, with the exception of performance tests.

3.7 PERFORMANCE TESTS

After testing, adjusting, and balancing is complete as specified, test each system as a whole to see that all items perform as integral parts of the system and temperatures and conditions are evenly controlled throughout the building. Make corrections and adjustments as necessary to produce the conditions indicated or specified. Conduct capacity tests and general operating tests by an experienced engineer. Provide tests that cover a period of not less than one day for each system and demonstrate that the entire system is functioning according to the specifications. Make coincidental chart recordings at points indicated on the drawings for the duration of the time period and record the temperature at space thermostats or space sensors and the ambient temperature.

3.8 CLEANING AND ADJUSTING

Provide a temporary bypass for water coils to prevent flushing water from passing through coils.

Thoroughly clean ducts and air terminal units of debris and blow free of small particles of rubbish and dust and then vacuum clean before installing outlet faces. Wipe equipment clean, with no traces of oil, dust, dirt, or paint spots. Provide temporary filters prior to startup of all fans that are operated during construction, and install new filters after all construction dirt has been removed from the building, and the ducts, plenums, casings, and other items specified have been vacuum cleaned. Maintain system in this clean condition until final acceptance. Tighten belts to proper tension. Adjust control valves and other miscellaneous equipment requiring adjustment to setting indicated or directed. Adjust fans to the speed indicated by the manufacturer to meet specified conditions.

3.9 OPERATION AND MAINTENANCE TRAINING

Conduct a training course for the members of the operating staff as designated by the Contracting Officer. Make the training period consist of a total of 4 hours of normal working time and start it after all work specified herein is functionally completed and the Performance Tests have been approved. Conduct field instruction that covers all of the items contained in the Operat ion and Maintenance Manuals as wel l as demonstrations of routine maintenance operations. Notify the Contracting Officer at least 14 days prior to the date of proposed conduct of the training course.

-- End of Section --