Flush Mount Adaptor Plate for the Flush Mount Heating and Air Conditioning Booster Fan, White
Used with Suncourt Flush Fit Register Booster.  Adapts booster fan to larger registers.Plate dimensions - 8" H X 13-3/4" W Fits Wall/Floor Register Sizes:• 6" x 10"• 6" x 12"• 4" x 12"