Arlington new fan fixture mounting box is the quick, easy way to mount a fan or fixture on a cathedral or sloped ceiling. FBB900 installs to a rafter for easy centering. Taller sides on the box allow it to fit cathedral ceilings with angles greater than 80 deg. also available FBB450 for sloped ceilings. Both have installed steel mounting brackets that save time and money in new construction installations. Forget the need to cut and attach a piece of wood to the box the installed bracket takes its place. For added convenience, the bracket is pre-drilled for screws and the ends are angled for easy fitting.