One aspect of the invention is an outlet box frame for installation in a hole in a floor structure. The hole having a perimeter and defining an internal wall surface in said floor structure. The frame including a walled member, at least one flange portion and a unitary retaining screw guide. The walled member being sized for insertion within the hole. The at least one flange portion extending outward from the walled member, wherein once installed at least a portion of the flange extends from the walled member past the internal wall surface. The unitary retaining screw guide supports a retaining screw. The screw guide being supported from the walled member and configured to receive the retaining screw therein. Upon installation, the retaining screw inserted in the retaining screw guide engages the hole wall without significant penetration thereof, providing at least pullout resistance of the frame from the hole. Alternatively, the outlet box frame may include the retaining screw.