Dayton tube heaters are gas-fired infrared heaters designed to provide comfort heat. They consist of three (3) main components: a burner control box, radiant tube, and reflector assembly. The heaters are typically suspended from the ceiling by chains and controlled by a thermostat. They can be installed either vented or unvented, and may use outside air for combustion if necessary. The burner box fan is a vital component to the tube heater. Item: Burner Box Fan For Use With: 5VD67 to 5VD80, AKA-7D837 to 7D851 (All Models)