233300_Air Duct Accessories.DOC

SECTION 233300 - AIR DUCT ACCESSORIES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Manual volume dampers.

2. Flange connectors.

3. Flexible ducts.

4. Duct accessory hardware.

1.3 SUBMITTALS

A. Shop Drawings: For duct accessories. Include plans, elevations, sections, details and attachments to other work.

1. Detail duct accessories fabrication and installation in ducts and other construction. Include dimensions, weights, loads, and required clearances; and method of field assembly into duct systems and other construction. Include the following:

a. Special fittings.

b. Manual volume damper installations.

B. Operation and Maintenance Data: For air duct accessories to include in operation and maintenance manuals.

1.4 QUALITY ASSURANCE

A. Comply with NFPA 90A, "Installation of Air Conditioning and Ventilating Systems," and with NFPA 90B, "Installation of Warm Air Heating and Air Conditioning Systems."

B. Comply with AMCA 500-D testing for damper rating.

PART 2 - PRODUCTS

2.1 MANUAL VOLUME DAMPERS

A. Acceptable Manufacturers:

1. Air Balance Inc.; a division of Mestek, Inc.

2. American Warming and Ventilating; a division of Mestek, Inc.

3. Pottorff; a division of PCI Industries, Inc.

4. Ruskin Company.

5. Engineer approved equal.

B. Construction:

1. Blades

a. Parallel- or opposed-blade design.

b. Stiffen damper blades for stability.

c. Galvanized steel, 0.064 inch thick.

d. Galvanized steel blade axles.

e. End Bearings:

1) Except in round ductwork 12 inches and smaller, furnish end bearings.

2) On multiple blade dampers, furnish oil-impregnated nylon or sintered bronze bearings.

3) Furnish closed end bearings on ducts having pressure classification over 2 inches wg.

f. Quadrants:

1) Furnish locking, indicating quadrant regulators on single and multi-blade dampers.

2) On insulated ducts, mount quadrant regulators on standoff mounting brackets, bases or adapters.

3) Where rod lengths exceed 30 inches, furnish regulator at both ends.

2.2 FLANGE CONNECTORS

A. Acceptable Manufacturers:

1. Ductmate Industries, Inc.

2. Nexus PDQ; Division of Shilco Holdings Inc.

3. Ward Industries, Inc.; a division of Hart & Cooley, Inc.

4. Engineer approved equal

B. Description: Add-on, factory-fabricated, slide-on transverse flange connectors, gaskets, and components.

C. Material: Galvanized steel.

D. Gage and Shape: Match connecting ductwork.

2.3 FLEXIBLE DUCTS

A. Acceptable Manufacturers:

1. Flexmaster U.S.A., Inc.

2. McGill AirFlow LLC.

3. Ward Industries, Inc.; a division of Hart & Cooley, Inc.

4. Engineer approved equal.

B. Insulated, Flexible Duct: UL 181, Class 1, 2-ply vinyl film supported by helically wound, spring-steel wire; fibrous-glass insulation; polyethylene vapor-barrier film.

1. Pressure Rating: 10-inch wg positive and 1.0-inch wg negative.

2. Maximum Air Velocity: 4000 fpm.

3. Temperature Range: Minus 10 to plus 160 deg F.

4. Insulation R-value: 4.2 square feet-hour-degree F per BTU

5. Flexible Duct Connectors:

a. Clamps: Stainless-steel band with cadmium-plated hex screw to tighten band with a worm-gear action, sized to suit duct size.

b. Non-Clamp Connectors: Nylon draw-strap

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install duct accessories according to applicable details in SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for metal ducts and in NAIMA AH116, "Fibrous Glass Duct Construction Standards," for fibrous-glass ducts.

B. Install duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel and fibrous-glass ducts, stainless-steel accessories in stainless-steel ducts, and aluminum accessories in aluminum ducts.

C. Install volume dampers at points on supply and return where branches extend from larger ducts. Where dampers are installed in ducts having duct liner, install dampers with hat channels of same depth as liner, and terminate liner with nosing at hat channel.

D. Set dampers to fully open position before testing, adjusting, and balancing.

E. Install test holes at fan inlets and outlets and elsewhere as indicated.

F. Connect diffusers or registers to ducts with maximum 48-inch lengths of flexible duct clamped or strapped in place.

G. Connect flexible ducts to metal ducts with clamps or draw strap

H. Install duct test holes where required for testing and balancing purposes.

3.2 FIELD QUALITY CONTROL

A. Tests and Inspections:

1. Operate dampers to verify full range of movement.

END OF SECTION

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Air Duct Accessories

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