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.

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"