The Pyronics XNM Series Excess Air Burners for single tunnel cool flame application are nozzle mixing types designed for 800% excess air. A unique design and stepped tunnel burner blocks produce excellent flame stability at all firing rates. New air-gas mixing principles produce very high excess air combustion without appreciable fumes at lower equipment costs. All sizes develop maximum ratings with 6 oz. air pressure and 2.5 oz. gas pressure at the burners. All XNM burners have inconel flame distributors and high temperature refractory blocks. Gas adjustor and flanged connections are standard. Pipe unions are not normally required. The integral mounting flange is designed for sealed firing in positive, neutral, or negative combustion chambers.


  • Annealing Furnaces
  • Air Heaters
  • Heat Treat Furnaces
  • Spheroidizing Units
  • Metal Melters
  • Incinerators
  • Stress Relieving Furnaces
  • Brick Kilns
  • Plate Heating
  • Sand Drying
  • Pebble Heaters
  • Crucible Heating
  • Multiple Purpose Furnaces


Features and Benefits

  • 500% – 800% excess air
  • Preheated air up to 750°F
  • Excellent flame stability with Excess Air, Excess Gas, On Ratio Firing
  • Instant lighting at all firing ranges
  • High discharge velocities
  • Low air and gas pressures required
  • Unique stepped tunnel design
  • Operation to 2500°F
  • Rugged, heavy-duty industrial construction
  • Burner ports for pilot, flame monitoring, and sighting (sight glass not included)
  • Intermediate flame length
  • Max. capacities: 200,000 to 6,000,000 BTU/hr