This Carlon VaporTite non-metallic saddle ceiling fan box features a 16 cubic inch capacity and rugged polycarbonate construction designed to withstand extreme temperatures without distorting or becoming brittle. Engineered for energy efficiency and compliance with modern home building codes, it is equipped with a drywall flange covered by a foam gasket and additional gaskets over the cable entry points to establish a draft-tight, vapor-tight seal that prevents air transfer. The box safely supports ceiling fans or light fixtures weighing up to 70 pounds by mounting directly over a standard ceiling joist for a stable installation. It includes integrated V-clamps for toolless, self-clamping cable entry and pre-drilled flanges to accommodate multiple mounting options with the included lag screws, ensuring a flush fit against 1/2-inch drywall panels