VentCool offers three ventilation fans with a high end  CFM range of 4000 to 5000 CFM. The Summit 3.4  and the Tahoe T4 whole house fans feature an AirLoc™ Gravity Damper. The Vista 3.5 whole house fan uses a PowerSeal R-49 insulated motorized damper. All whole house fan models feature multiple speeds and timers.

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