Infrared Radiant Products The following sales and technical literature are available for viewing in PDF format: Low Intensity Pressurized Tube Infrared Unit Heater – Model RLP General Information AIR 9-106 - Low Intensity Infrared Unit Heater - Sales Piece Technical Literature AIR 9-117.3 - Low Intensity Infrared Unit Heater - Technical Manual AIR 9-506.3 - Low Intensity Infrared Unit Heater - I&S Manual AIR 9-410.3 - Wiring of Multiple Single Burner Low Intensity Infrared Unit Heaters AIR 9-505.4 - Combustion Air Intake Collar Installation Instructions Miscellaneous  AIR 9-200.3 - Infrared Unit Heater Design & Engineering Guide