Detroit Radiant Products Company is the largest manufacturer of gas-fired infra-red heating equipment in the U.S. Enjoy savings up to 50% in fuel costs over hot air systems in commercial & industrial buildings. Detroit Radiant Product's brochure outlines nine product lines, which includes the award winning, patented HL Series of Two-Stage Infra-Red Tube Heaters. Call 800-222-1100 or visit www.reverberray.com for additional information.