Backdraft Control System for Wall Fans designed by a Breeder for Breeders the most efficient backdraft control solution for your wall fans 3-iN-1 SoLutioN: » Prevents non-filtered air infiltration Less than 3.5 cfm air infiltration (18” fan). » minimal air flow restriction Fan is efficient at more than 96% of its capacity (18” fan). » eliminates installation of insulated winter fan cover Requires no additional fan cover and la

» how does no backdraft work? The No BackDraft system features a simple, robust and ingenious automatic close/open mechanism. It keeps the fan damper opened at the required angle to maximize air flow. When the fan stops, the damper closes airtight with sustained pressure against the rubber seal. This mechanism requires no electricity and works in perfect unison with the fan action. 18” Fan Comparative Test Results No BackDraft Air infiltration 0.5 in. water (static pressure) Traditional louver Test results clearly show that the No BackDraft system is by far the best solution to control wall fan...