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TranSystems Corporation - LGM Construction

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501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11<br />

3.5 Flexible ductwork shall be attached to take-off fittings by use of sheet metal screws a minimum of 6 inches<br />

on center with a minimum of 3 screws uniformly spaced and taped.<br />

3.6 No part of an insulated duct system shall be obscured from insulation. For rigid ductwork, insulation shall<br />

be field cut to desired length with approximately 1-foot overhang of insulation and vapor barrier. This<br />

portion of insulation and vapor barrier shall be slipped over the take-off fitting and the diffuser to prevent<br />

condensation. Volume dampers and control rods shall remain accessible. Flexible ductwork shall be<br />

installed in a similar manner.<br />

3.7 Ductwork penetrating wall surfaces shall be sleeved with 22 gauge galvanized steel sheet metal to permit<br />

the passage of ductwork and maintain 1/2 inch to 1 inch clearance around the outside of the duct. After<br />

installation of the duct, this clearance shall be tightly packed with 3 PCF fiberglass and sealed air-tight.<br />

Provide 1/8 inch galvanized steel angle collars on both sides of the penetration to cover wall openings and<br />

provide a neat finish. Support vertical duct risers with angle brackets and completely seal off the hole<br />

through the floor. Provide fire stop as required.<br />

3.8 Installation shall comply with ASHRAE, SMACNA, and NFPA.<br />

AIR DISTRIBUTION 15800-7

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