High Intensity Rayhead, For Use With 3E132-3E134, 3E460-3E462, 5VD61-5VD66 RestrictionsNote: Not for residential use; see infrared tube heaters. Must mount 20 to 35 from horizontal, preferably facing inward around the perimeter of the heated area. Gas-Fired High-Intensity Infrared Space HeatersCompact modular heaters are great for spot heating and provide proven fuel savings over unit heaters. High-intensity ceramic burner generates concentrated infrared energy, which is directed to floor level to warm people, objects, and the surrounding air. Feature highly polished aluminum reflector, water-resistant circuitry, and mounting chain. Installation information: 1/2" NPT gas inlet. Heated area requires 4 cfm of exhaust ventilation for every 1000 BtuH of infrared heat.CSA Blue Star Certified.Provide efficient, reliable infrared heat Electronic ignition; 100% automatic gas shutoff Noncorrosive aluminum and stainless steel construction Preassembled and ready to install