Backdraft Damper

An ideal solution to eliminate cold drafts from leaky shutters. Mounts over shutter on inside of building. Air flow created by fan draws lid open, lid closes tight when fan not in use. Constructed out of polyethylene, fully insulated to prevent freezing.

Model No. BD-1220:
26" square opening for 12" - 20" fans

Model No. BD-2428:
26" square opening for 24" - 28" fans