Uses Kerosene and is perfect for workshops, greenhouses, farms, warehouses. ***Two 25' ducts included***. ***100% clean heat, flame never touches heated air. *** Indirect heaters work the same as a home furnace using a heat exchanger to heat the air. For Maximum heat and efficeincy, use two ducts, one to deliver hot air and one to return air from the heated space to the heater. Heating heated air instead of drawing in cold air from the outside greatly increases effectiveness all without fumes or smell. THis heater can be used to kill bed bugs. If you are able to do a bit of research on sites like this you can kill the little critters in short order once you get the room to 120 degrees or so https://bedbugheatspecialist.com/what-is-heat-remediation-for-bed-bugs/. Sometimes referred to as a diesel heater.

Our oil indirect fired heater has high output, high thermal

efficiency and high airflow and is ductable up to 100 feet. Output of 170,000 BTU/HR with a 230 degree air output temperature.

Cubic foot of area x .133 x desired temperature rise = btu size needed