Mercury Makeup Air Unit

Direct Fired, Gas Furnaces & Re-circulation Systems

Spray Tech / Junair / Mercury Makeup Air Unit
Spray Tech / Junair manufactures highly efficient direct-fired gas furnaces, which convert 98% of the fuel into heat. We also offer an 80% re-circulation system to further increase fuel efficiency. Variable Frequency Drives (VFD’s) are used to balance air pressure, extend exhaust motor life, and increase energy savings.


  • Horizontal and vertical configurations
  • Interior and exterior installation approved
  • Single, two speed, and multi-speed fan controls
  • Manufacturing, aerospace, building, automotive, industrial
  • Custom applications / Process heat
  • Complete engineering services available
  • UL listed components for years of trouble-free service
  • Powder coating over G-90 galvanized steel


  • Two-year Parts Warranty on all models


Unparalleled ease of installation and servicing through:

  • Extra large access doors and viewing windows on both sides
  • Circuit board mounted relays make servicing easy
  • Manifold mounted gas pressure gauge
  • Built-in electrical disconnect
  • Built-in temperature sensor
  • Primary and secondary circuit breaker protection
  • RJ-45 connection between heater and remote panel
  • Automatic heat on demand- No summer / winter switch
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