An All-Pro Portable Heater, a kerosene-fueled product by Scheu Products Company, is made only for indoor use in a well-ventilated space. The product manual cautions that the heater should never be operated in areas normally used for habitation.
The All-Pro is a direct-fired, forced air heater most commonly used for temporarily heating buildings under construction or repair. Direct-fired heaters push all combustion products into the heated space, where toxic carbon monoxide can accumulate. The user is responsible to maintain proper ventilation in the heated space, ensuring a minimum of two square feet of opening near the floor and also at the ceiling. Between the heater and the floor, an insulating barrier material of one inch thick or more is recommended.
Scheu also makes an All-Pro Portable Kerosene Torpedo Heater for outdoor use, with the capability of heating from 9,0000 to 29,000 cubic feet.