Damper opens with air flow and closes when the air flow stops. Spring loaded with positive closure and a rubber gasket. 4".

Sizes available:
6", 8", 10" & 12"

The highest power motors combined with its aerodynamically designed shape make Typhoon inline fan the performance leader in its category.

The Typhoon 4" Inline Fan has the highest power motor combined with its aerodynamically designed shape make the Typhoon inline fan the performance leader in its category.

ThermoFlo 2000 Premium Ducting is specifically engineered to handle unconditioned air. The 2000 SR Series can withstand high heat, high humidity and excessive CFM's without any failure or fatigue.