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TranSystems Corporation - LGM Construction

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

B. Fan shall be arranged for supply air operation.<br />

C. Provide polyester resin coating to all interior metal surfaces.<br />

D. Sound data required.<br />

E. Provide permanently attached identification tag.<br />

2.4 DUCTWORK<br />

A. Ductwork and plenums shall be rated for 2 inch wg, fabricated of galvanized steel with 0.90 oz/sq<br />

ft (G90), zinc coating, ASTM A525.<br />

B. Joints and connections shall be sealed using mastic or mastic plus tape to minimize air leakage.<br />

Mastic and tape shall be specifically recommended by the manufacturer for the application<br />

intended.<br />

C. Ductwork shall be constructed with air-tight lock joints, seams, and braces in accordance with the<br />

latest issues of SMACNA Manuals and ASHRAE Guide.<br />

D. Reinforcing shall be either riveted, bolted, or welded securely to duct sheet to prevent vibration.<br />

E. Duct dimensions shown on the Drawings are free area and do not include duct liner.<br />

F. Throat radius of curved elbows shall be 1-1/2 (minimum) times duct width. Where not possible<br />

and where rectangular elbows are used, provide air foil type turning vanes.<br />

G. Duct size increase shall not exceed 15 degrees divergence where possible. Maximum divergence<br />

upstream of equipment shall be 30 degrees. Maximum convergence downstream of equipment<br />

shall be 45 degrees.<br />

2.5 DUCTWORK - ROUND<br />

A. Ductwork shall be fabricated of galvanized steel with welded longitudinal seam. Duct and fittings<br />

shall be provided with slip joint connections. Seal joints with mastic and tape per manufacturer’s<br />

recommendations. Provide ductwork in accordance with SMACNA and ASHRAE requirements.<br />

Throat radius of curved elbows shall be 1-1/2 (minimum) times duct diameter.<br />

2.6 DUCT JOINT SEALANT<br />

B. Fabricate ductwork as follows:<br />

Duct Dia Gauge<br />

Up to 50 inches 20<br />

52 thru 60 inches 18<br />

62 thru 84 inches 16<br />

AIR DISTRIBUTION 15800-3

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