Air Zone Very Quiet Exhaust Ventilation Fan - Panamex/Air Zone PA500V, PA700V, PA900V, PA1100V
The Premium Zone Series is known
as the quietest ventilation fan in the market.
The housing is made of steel, which is painted in black with rust proof paint,
and installed with a metal damper to prevent back draft of cold air. The PA500VL model with noise
level of 0.4 sones, comes with 2 extendable brackets for installation cases
which are not against the joist.