4 in round Dia duct|Built-in backdraft damper|Built-in metal flange provides blocking for penetrations through drywall as an air barrier and assists with the decrease in leakage in the building envelope during blower door testing|Simply mounts directly to the joist using 4 screws between top and side panels
Panasonic Universal Housing Can, 7-7/8 in Width, 7-7/8 in Depth, 4 in Height, Steel, Hot Dipped Galvanized, For Use With: EcoVent U-Can Contractor Pack and WhisperGreen Select Series Ventilation Fan, Domestic/Import: Import