8.0 Cu. In. 4" dia. round fan support box for use with nonmetallic sheathed cable - 1/2" deep base with side cube wiring capacity, fan/fixture screws for joist mounting, ground screw - New and old work residential construction 2 HR fire resistive walls and ceilings (70 lbs. fan support and 110 lbs. fixture support) - Fiberglass - thermoset box - Size: Depth=1 1/2", Dia=4" - Bottom mount