Ceiling fan box with brace 1-1/2 deep 15.8 cubic inch box for new work to hang ceiling fans and light fixtures between joists or structural members safely and securely. Drawn construction. Maximum 70 pound fan or 90 pound fixture. Brace is adjustable form 16 to 24 . Includes 2 end 1/2 knock outs. Acceptable for use in 2-hour fire rated walls and ceilings. UL Listed. The Kwick-Brace New Construction Brace is a 1-1/2-inch deep box for non-metallic sheathed cable clamp for installation of lighting fixtures or ceiling fans.