The Westinghouse Sidemount Plus All-Metal Fan Box allows you to safely install your ceiling fan or lighting fixture without having to access attic space. The Sidemount Plus features a heavy-duty, 2-1/8-inch-deep, dual-mount electrical box with a 21.5-cubic-inch wiring capacity. The box's design provides secure attachment to an existing ceiling joist. It is ideal for installation during new construction or remodeling, and can be installed in finished ceilings. To install it in a finished ceiling, simply mount the bracket to a joist through a 4-inch hole in the drywall, pull the wire into the box, and remount the box to the bracket. UL listed to support fans and light fixtures up to 70 pounds, and includes 10-24 threads for heavier fans and fixtures, and 8-32 threads for cover plates and lightweight lighting fixtures. Westinghouse is a trusted, global brand. Westinghouse knows lighting and offers products with exceptional quality, reliability and functionality.