Gas-Fired Low-Intensity Infrared Tube Heaters • Proven fuel savings Compact size Minimal assembly requiredHighly polished, multi-facet reflectors direct heat to floor and objects, which reradiate heat to surrounding areas. Dual-ignited multi-burner and coated aluminized steel multi-exchanger platform provide broad heat output pattern without hot spots. Units are equipped to accept outside combustion air and can be direct vented. Include mounting chains, 4" vent adapter fitting, 81" spiral vent pipe, 24" stainless steel flexible gas connector, and 1/2" FNPT gas shut-off. For spot heating, high wind applications, restaurant patios, vestibules, valet waiting areas, bus stops, golf ranges, and agricultural buildings. Certified to ANSI Z83.20 for both indoor and outdoor use with optional outdoor kit, and to agricultural and commercial/industrial standards. Installation information: 120V/1 Ph/60Hz., 1.5A starting, 1.1A running. 24V thermostatic control (external transformer required when operating multiple units with one control). 4" single vent (sidewall or roof). Heated area requires 4 cfm/1000 BtuH (0.38 m3/kW) input of installed heaters.Note: Not for residential use.