These newly developed back-draft dampers are manufactured with quality components and precision engineering.
The back-draft damper is used to prevent air from reverse flowing through the fan (when powered off) which allows no contaminated air to escape from the area untreated.
Can-Filters recommends the usage of back-draft dampers as another line of defense against odor control.

Can-Filters Backdraft Dampers are available in 6 different sizes from 4″ to 14″