The “Muffler” Acoustic Fan Plenum Riser
The Muffler is specially designed to raise the HV1000, HV1450 and HV1600 off the attic floor joist by 12″.
If your attic floor joists are not exactly 16″ odc or 24″ odc, install this below the HV units described above for a perfect fit so, no joist cutting is necessary.
Equipped with acoustic absorbing material to reduce the sound levels of the fan.
Made of 20 gauge galvanized steel.