Products – Heaters


MAC4.2 Indirect Fired Heater

Model: MAC4.2

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About the MAC4.2 Indirect Fired Heater

The MAC4.2 is currently our largest heater drag-skid platform available. It delivers 4,200,000 million BTU’s per hour of heat. It is an indirect diesel fired heater that provides clean, safe, and reliable air flow capable of ducting long distances with minimal loss of air pressure or outlet temperature for your largest projects. The MAC4.2  is comprised of rugged, heavy-duty steel construction inside and out. Large doors provide easy access for service, maintenance, and operation.

The MAC4.2 has a temperature rise of up to 180° F (82° C) and an air output volume of 21,000 cubic feet per minute at 3 inches of static pressure, delivered through a single 36 inch outlet. The heat exchanger is designed and constructed of stainless steel. We offer simple to use, push button controls for ease of operation.

Features & Benefits



  • 4,200,000 BTU/hr (1,231 kW/hr)
  • Output Air Volume: 21,000 CFM @ 3" static pressure
  • Normal Operating Fuel Rate: 31.3 GPH (118.5 lph)



  • Burner fuel source
    • Diesel



  • Burner fuel source
    • Propane
    • Natural gas
    • Dual fuel
  • Modulating burner
  • Custom paint
  • Optional outlet duct sizes