The IR Series is a high intensity infrared heater commonly used in areas with high air infiltration, high ceilings, and/or spot heating applications. This IR-90 is a 90,000 BTU/h, natural gas ceramic heater with 120V controls. A ceramic radiant heater with a high temperature infrared generator, stainless steel rods, and a bright polished aluminum reflector, the IR series will heat your commercial, industrial, or outdoor space quickly. Observe all clearances when installing. NOT RESIDENTIALLY APPROVED.
INSTALL MANUAL (link) <-- Please confirm your "Clearances to Combustibles" on p5