Indirect Fired Heat:
Indirect fired heaters are similar to oil- or gas-burning furnaces with chimneys in homes. In such units, a flame in a burn chamber warms the heat exchanger.
The device draws cool air into two different chambers. The air passes over and around the heat exchanger and gets warm. The air that the heater discharges is clean, making this type of heater good for applications that require sanitary conditions, such as health care facilities, food processing plants and areas with chemically sensitive products.
Advantages:
The air emitted is 100 percent clean and dry.
The air circulated in the unit does not contact the flame.
The heater re-circulates air, which saves fuel.
You may use ductwork to deliver hot air into different areas of a project site without the risk of fuel-hazardous byproducts, such as carbon dioxide.
Because the heaters don’t release harmful gases, you can use them in tightly sealed spaces.
Units have built-in thermostats for temperature control.
The heaters are good for frost protection and accelerating drying processes.
Disadvantages:
Indirect-fired heat involves multiple working parts, making it less efficient than direct-fired heaters.
Rental prices tend to be more expensive compared to direct-fired heater rental costs.
Indirect-fired heaters use about 80 percent of the combustion gases to heat air.
The heaters are larger than direct-fired heaters, making them more difficult to transport.
The heater uses oil or gas, as well as electricity.
While the heater produces clean air, it requires exhaust ventilation using a flexible tube that vents the fumes outside.
