Ventilation: Quiet breezes
The magic is in the installation. The fan motor is mounted in the attic's rafters and insulated ductwork conveys air from the individual rooms to the attic. Fan noise in living areas is very low - about half the sound level of a humming refrigerator.
The fan motor is warranted for 10 years and one unit costs $465, with discounts for multiple purchases (July 2004).
Each unit includes air diffuser (grille), fan motor housing and seven feet of flexible duct work.