Air Heaters

The first Air Heater NAO manufactured was in 1941. NAO offers a wide range of low, medium and high intensity designs of Air Heaters;

  • NAO Duct Air Heaters
  • NAO Horizontal Air Heaters
  • NAO Down-fired Air Heater
  • NAO In-Line Air Heaters

NAO’s direct-fired air heaters are designed to match the requirements of a wide range of process applications:


  • Atmospheric Control
  • Catalytic Cracking
  • Coal Driers
  • Coal Gasification
  • Crop Driers
  • Dehydration Units
  • Food-Process Driers
  • Fluidized Beds
  • Furnace Drying and Preheating
  • Heat Exchangers
  • Malt Kilns
  • Paper Driers
  • Rotary Driers
  • Stress Relieving
  • Other Applications

NAO’s goal is to supply a client with a prepackaged air heater complete with a UL Listed Control System, Burner Management System, High Efficiency NAO Burner, High Energy Ignitor(s), and Air Heater Chamber as required for each application.


NAO’s Combustion chambers are supplied insulated with a refractory insulation rated for the operation.  From Lightweight Ceramic Fiber, and Vacuum Formed Ceramic insulation to a castable refractory lining, for high operating velocities.

  • Long operational life with minimal maintenance.
  • Required heart load can be met with oil, gas, or combination fuel-fired units.
  • Simple and heavy-duty control package, manufactured per our clients specifications, by NAO’s UL Audited and Accredited Panel Building Division.

With over 100 years of experience NAO has earned a worldwide reputation for reliability and trouble-free performance.