For fans that do not have built-in back draft dampers, our butterfly dampers should be used to prevent cold air from entering the house. These Famco dampers are galvanized and have a high-quality foam seal to prevent air infiltration. They can be used in either vertical or horizontal applications.
| Weight | 1 lbs |
|---|---|
| Dimensions | 8 × 7 × 7 in |
| Diameter | 4", 5", 6", 7", 8" |
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