Bulb heater/fans provide silent warmth and superior ventilation in a compact package. Heat and ventilation functions may be controlled separately or in combination so you re always in control of the environment. Very low profile, white polymeric grille blends into most ceilings. 70 CFM fan provides excellent ventilation at a quiet 3.5 Sones and will keep your bath free from steam or bathroom odors. Use 250W BR40 size infrared bulbs not included for comfortable heating performance. Quiet, highly efficient polymeric blower wheels maintain consistent power, while polymeric dampers prevent back drafts and eliminate mechanical noise for reliable operation and a comfortable environment. UL listed for safety. Sturdy steel housing, a plug in, permanently lubricated motor, adjustable mounting brackets with keyhole slots and a 4 Inch round duct connector with tapered sleeves combine to make installation logical and simple. Control operation with a choice of wall controls, available separately. 57W, 57V, 59W, 59V, 61W, 61V, 63W, 63V, 64W, 64V, 68W, 68V, 70TW, 71V, 72W, 72V, 269WL, 269VL, DH100W or T24H. Ceiling heaters are intended to provide supplemental heat and not to take the place of the home s main heat source.