For use with the Quiet Cool 6400 whole house fan is you are going to mount it vertically on a wall. This adapter will make sure that the dampers close completely.
For QC 6400- For use with a 14″ x 36″ damper box
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DBA Whole House Fans
29021 Ave Sherman STE 103
Valencia, CA 91355
Toll Free: 1.888.229.5757