An electrical box for mounting a ceiling fan or a light fixture in which the electrical box is the sole support for the fan or fixture. The electrical box has mounting holes on its sides for receiving fasteners for securing the electrical box directly to a joist, beam, or other structural support member. Preferably, the fasteners are nails to provide an easy installation. The electrical box has flanges with both fixture and fan mounting holes as well as holes for mounting a cover. A cover can be mounted directly to the electrical box. The cover can be the attaching element between the electrical box and the fan or fixture.