Indicate size, capacity and noise reducing characteristics of all silencers on plans, including silencers for vane-axial fans.
Indicate all acoustical lining on drawings, generally:
• fan plenums
• both sides of room mounted fans
• upstream of roof mounted fans
• supplement to fan silencers
• downstream to air terminal units
Check air velocities and use perforated metal liner for velocities over 3,000 FPM (15 m/s). Schedule in specification completed.