These durable ceiling mounted heaters have a long-lasting white powder coat finished 20 gauge steel grill. Recess mount ceiling heaters have an enclosed steel fin sheath element. The propeller fan blade has 1300 PRM motor that provides 425 CFM. Radial diffuser helps increase coverage area. 208V, 240V and 277V Heaters feature a manual reset thermal limit that de-energizes ceiling heaters if they over heat. 480V Heaters feature automatic reset thermal limit, 24V control transformer and 24V relay. Heaters measure 23-1/16"L x 23-1/16"W x 9-1/8"D rough in. UL approved. 1 Year Limited Warranty.