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Generac Mobile Products

MAC4.2 Indirect Fired Heater

generac mac4.2 mobile indirect fired heater

The MAC4.2 is Generac?s largest skid-drag mounted mobile indirect fired heater. This heater can duct 4,200,000 BTUs per hour up long distances with minimal loss of heat and air pressure, which makes it perfect for big construction sites and other large applications. The rugged steel construction, large access doors, and push button controls means that this heater is easy to operate anywhere you need a lot of heat.


  • 4,200,000 BTUs
  • Air output volume of 21,000 CFM, delivered through a single 36 inch outlet
  • Temperature rise of 180?
  • 31.3 GPH normal operating fuel rate
  • Static pressure: 3 inches

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