Gas-Fired, Gravity-Vented, Fan-Type, 25,000 - 400,000 BTUH Input

Reznor's F gas-fired, gravity-vented unit heaters are designed for ceiling suspension with a propeller fan for air delivery with 80% thermal efficiency. It may be used with natural or propane gas, as specified, in sizes from 25,000 to 400,000 BTUH gas input. These units are approved for installation in the United States and Canada by the Canadian Standards Association (CSA).

Model F units require the addition of spark pilot option AH2 or AH3. They are not certified for residential use.

F Product Literature


Key features of the F

  • Orifices for natural gas
  • Aluminized steel heat exchanger
  • Aluminized steel burner rack with stainless steel insert
  • Spark ignited, intermittent safety pilot with electronic flame supervision
  • Single-stage combination gas valve (field adjustable for high altitude operation)


The F can be used in many markets including:

  • Retail
  • Showrooms
  • Workshops
  • Industrial Manufacturing
  • Warehouse/Distribution

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