Highlights: 3-9/16" depth x 2-1/4" x 3-3/4" Cu. ft. in. capacity: 22.5 Ul listed Single gang - new work 2 hour wall and ceiling fire rating Shatter resistant in cold temperatures Nails are installed as fastening devices Thermoset-fiberglass, with angled mid-nails Lightweight, non-corrosive, non-conductive, no ground required, will not melt or distort in high heat