The high output, industrial grade, portable electric blower is a work horse. The BDH Series heater can be left unattended without the threat of poisoning from combustion by-products, associated with fuel fired heaters. Practical uses are factories, enclosed areas, enclosed smoking areas, building construction where "localized" temporary heat is needed, and repair stations are just a few examples of where DBH Series portable blower heaters can be used. Offers up to a 46°F temperature rise if ambient temperature is 30°F. Must be used in an enclosed room with 15' maximum ceiling height.