Frost King MC815-3 White Magnetic Vent Cover 8" x 15", specially designed for walls, floors, or ceiling metal vents. This cover fits registers up to 8" x 15". This cover seals vents to help improve efficiency, it redirects warm air in the winter and air conditioning in the summer, it can be painted, stenciled or wallpapered to to match decor, and easily cut to fit vent size.