AirScape fans are extremely quiet for their power. However, if you have the attic space, there is a nice trick to reduce sound levels even further. The Acoustic Plenum Box adds 12 inches to the total height of the your AirScape installation and can reduce operating sound levels up to 3 dBA.
Insulated 12" raised-frame 20 gauge (.036") thick galvanized sheet metal construction with 1.5" of acoustical insulation. Ships flat and is easily assembled. The kit includes insulated raised frame and installation hardware.
Order ACP-01 for use with whole house fans with base of 14.5" x 22.5", including AirScape 1.7 and 3200 models
Order ACP-02 for use with whole house fans with base of 22.5" x 26.5", including AirScape 3400, 4300, and 5300 models