Broan 504 10" Vertical Discharge Ventilation Fan 350 CFM 6.5 Sones Installs Easily Between Ceiling Joists Fits 10" Round Duct - Use Model 472 Transition/Damper (Available Separately) for 8" Round Duct 350 CFM 6.5 Sones Installs easily between ceiling joists Fits 10-Inch round duct - use Model 472 transition/damper available separately for 8-Inch round duct Built in damper minimizes backdrafts Elim
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