Model BDD-042 - Back Draft Damper Brochure

Chasis and blades are made of galvanised steel sheet or aluminum profile. Back Draft damper is designed to prevent back-flow when fan motor is off and to open when fan motor is on. Provides one-way flow in ducting system. Has two models: Standart Model (BDD-142) and Circular Model (BDD-242). Reduces the heat loss and prevents ingress of dust, rain, insect and bird when system is off.  Optional: Flow rate - Pressure settings can be done with balance load. Provides fast response against extreme pressure changes in the ducting system by opening blades.