UL / C-UL listed for suspended, totally exposed outdoor, and indoor comfort heating applications, including exterior snow/ice control applications. UL / C-UL listed for recessed applications. Clear Quartz Lamp heating elements, offered in both 2-Lamp and 3-Lamp heaters that operate on 208, 240, 277, 480 Volts, for direct wire connection. Gold anodized one-piece reflector offered in 30, 60, or 90 degree symmetrical, including 30 and 60 degree asymmetrical heat patterns for various distribution of infrared heat. Feature two different housing materials: 20-gauge Stainless Steel or Galvannealed Steel painted with a high temperature powder coated brown finish. Built-in surface mounting bracket allows for fixture adjustment up to a 45 degree horizontal tilt. 2-Lamp heaters operate on single-phase operation (consult factory for 3-phase wiring). All 3-Lamp heaters operate on either single or three-phase wiring. Infrared heating systems heats people and objects to a desired temperature level, creating a safe and clean atmosphere. High-intensity radiant infrared heating elements provide the maximum heat output in less than 60-seconds. Unit provides the ability of staging and zone control flexibility. Three element heaters provide 50 percent higher watt densities than two element units.