Acoustical Ductwork Clause Samples

Acoustical Ductwork. 1. Where shown on the Drawings, provide United Sheet Metal Co. "Acousti-K27" or approved equal acoustical ductwork. Ductwork shall be of the double wall zinc coated steel type spaced 1" apart and uniformly packed with fiberglass insulation with effective thermal conductivity of .27 BTU/hr./sq./ft./degrees F. at 75 degrees F. mean temperature.