FeaturesUnique L-Shaped bracket simplifies installation and provides strong supportUL approved for ceiling or wall mount (actually fits in a 2 x 4 stud wall)Wall Installation reduces cost by eliminating the need to incorporate a radiation damper when penetrating fi re rated ceilings, making it ideal for multi-family applicationsLighted models feature a contemporary grille design with (2) 13W self-ballasted GU24 base CFL lampsEngineered to comply with ENERGY STAR® 4.0 requirement for increased efficiency (CFM/Watt)Lighted models Include a convenient night-light feature10-1/2 in mounting opening3.6 cfm/W energy efficiency