The QuietCool QC-1500 whole-house fan and ventilation system is not mounted to the ceiling, but instead is suspended from the attic with straps from the roof rafters. It's connected to a ceiling diffuser with a flexible insulated duct, thus eliminating vibration, rattle, and noise in the house, says the company. It can be installed almost anywhere in a ceiling or vertical wall in less than one-third the time it takes to install a typical whole-house fan, claims the manufacturer.

West Connection Enterprises, 24307 Magic Mountain Pkwy., Ste. 182, Valencia, CA 91355; 661-291-1013;

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