Home made heat exchanger with 2000 cfm blower and electrostatic filter. The burner is approx 150,000 BTU with a Beckett Oil Burner massaged to work well on Kerosene. Takes edge off hangar area and can allow glassing year round. When we do something smelly in the tent, constant flow of fresh air in and we add heat or cool (or both to dehumidify) if needed.