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; www.quietcoolfan.com.