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Weather-Rite Indirect-Fired (IDF) Makeup Air Unit

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Need heat in your plant this winter?
Make-Up Air Unit


Indirect fired (IDF) makeup air systems generate 100% clean air without the energy expenditure of an electric heater. IDF units use a secondary heat exchanger to separate breathable air from combustion air. The unique design of the IDF offers energy savings with simplified maintenance.


  • 3,500 CFM to 57,000 CFM
  • Industrial drum and tube heat exchanger
  • Welded unibody construction
  • 100% outdoor makeup air or re-circulation
  • Upright or horizontal, indoor or outdoor configurations
  • ETL listed for the United States and Canada

Options include but not limited to:

  • Evaporative or DX and chilled water cooling available
  • All stainless steel heat exchanger construction
  • External spring or neoprene pad vibration isolators
  • Fused disconnect switch for single-point connection
  • Two-position inlet and discharge dampers to control airflow
  • Discharge heads and burners to deflect airflow in require direction
  • Inlet hood with bird screen to prevent unwanted weather or debris in a horizontal unit


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Additional Resources:

Literature 1: IDF Brochure

Literature 2: IDF Dimension & Performance

Literature 3: IDF IOM

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