25.0 Cu. In. 4" dia. round fan support box for use with nonmetallic sheathed cable - Machine tapped fixture holes and bolts/nuts for fan mounting, adjustable mounting plate for additional substrate thickness - New and old work residential construction 2 HR fire resistive floors and ceilings (70 lbs. fan support and 90 lbs. fixture support) - Polycarbonate - thermoplastic box with galvanized hanger bracket - Size: Depth=2 3/4", Dia=4" - Mount with Internal screws with adjustable slider plate for substrates 1/2" to 1 5/32"