Roberts-Gordon expands product line to include COMBAT® axial fan unit heaters Roberts-Gordon, a manufacturer of infrared and warm air heating products, has recently added a line of axial fan unit heaters to the company's product offerings. Under the trade name COMBAT® by Roberts-Gordon UHA-Series, these units are for commercial and industrial applications such as vehicle repair/service shops, warehouses, and manufacturing facilities. Available in a wide range of inputs from 30,000 Btu/h to 400,000 Btu/h as well as both natural gas and propane gas models, COMBAT® heaters provide a minimum of 82% efficiency with the use of a tubular heat exchanger and power venting. The units are also equipped with a remote fan operation to provide optional summer air circulation. Available separated combustion chamber units use 100% outdoor air for combustion to protect units where indoor air contaminants are present.