Quietcool qc hv1000 whole house fan, 2 speed, 115v

The QC HV 1000 is a simple dual motor system that installs from below into a ceiling space between 16" on center joists. During operation, gravity damper doors open and when turned off, the damper doors simply close tight maintaining the R 6.8 insulation value; see, no more broken motorized dampers!
For some reason, fan manufacturers have struggled for years trying to design a simple, yet strong and reliable ceiling mount whole house fan. From fancy, motorized damper fans that fail, to noisy attic fans of yesteryear, nobody could seem to get it consistently right. Until now.
The QC HV 1000 is a simple dual motor system that installs from below into a ceiling space between 16" on center joists. During operation, gravity damper doors open and when turned off, the damper doors simply close tight maintaining the R 6.8 insulation value; see, no more broken motorized dampers!
How about energy efficiency? In the trueQuietCool tradition