16.0 Cu. In. 4" dia. round fan support box for use with nonmetallic sheathed cable - Fixture support bolts and nuts included, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - New work residential construction 2 HR fire resistive walls and ceilings (35 lbs. fan support and 50 lbs. fixture support) - Fiberglass reinforced polyester - thermoset box - Size: Depth=1 3/4", Dia=4" - Mount with Bottom mount