These infrared heaters discharge instant, high-density radiant heat that is used for indoor industrial and commercial comfort heating applications. Infrared heaters provide a linear, compact and concentrated source for spot heating. Heaters feature a 60 degree symmetric heat pattern and include heavy-duty aluminum extrusion with a bright aluminum insert for maximum reflectivity. Anodized aluminum housing is 0.62 thick. Mounting clearance requires 24" from any vertical surface and from face of heater to combustible surface, 36" from adjacent heater and 94" from the floor. Single Phase. Measures 3-3/4W x 3-3/8H. UL listed with quartz lamp heat elements (sold separately) with various voltages. 1 Year Limited Warranty.