Direct fired gas make-up air units

KEES Model DFG direct fired gas make-up air units are available in four housing sizes incorporating eight blower sizes (9" through 20" single blowers and 18" through 20" twin blower units) with air flow capacities from 1,000 to 30,000 CFM, heating capacities to 4,800,000 BTU input, and total static pressures up to 4" w.g. The Model DFG is ETL listed in accordance with the stringent requirements of ANSI standards Z83.4, and is FM and IRI compliant.

These units are offered in a choice of four housing sizes, three discharge orientations and five curb/mounting arrangments.

Standard Construction


    • Heavy-gauge weather proof galvanized steel housing
    • Down discharge
    • 1" thick 3# density fiberglass insulation
    • Large gasketed access panels with draw tight tooled fasteners
    • Heavy-gauge base frame with lifting lugs
    • Intake hood with bird screen
    • V-bank filter rack
    • 1" permanent filters


    • Forward curved double width, double inlet blowers
    • Statically and dynamically balanced blower wheels
    • Precision machined shafts and sealed ball bearings
    • Adjustable motor mount and drives with belt selected for 165% of motor horsepower
    • NEMA frame ODP motor
    • Three phase 1 HP and above motors are EPACT high efficiency rated
    • Blower and motor mounted on vibration isolators


    • Natural gas
    • Adjustable profile plate
    • Observation window


    • UL recognized components
    • Wiring in accordance with NEC
    • Single point pre-wired motor control center with main fusible disconnect, motor starter and control transformer
    • Maxitrol Series 14 discharge temperature control
    • High and low airflow switches
    • Burner control module
    • Flame rod
    • Spark rod
    • Ignition transformer
    • High temperature limit switch
    • Pilot solenoid valve
    • Main solenoid valve
    • Second solenoid valve
    • Modulating valve


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    DFG Direct Fired Gas Make-up Air Unit Variable Air Volume
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    DFG with Vertical Housing
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    DFG Roof Curb Arrangements
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    DFG Manifold Diagram
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    DFG Wiring Diagram
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    Other Information

    Options & Accessories


      • Flat filter section in intake hood
      • Delete intake hood
      • Foil faced insulation
      • Double wall insulation
      • Painted housing
      • Stainless steel housing
      • End discharge
      • Top discharge
      • Duct adaptor
      • Four way discharge head
      • Floor rubber in shear isolators
      • Hanger spring isolators
      • Vertical unit
      • Equipment stand for vertical unit
      • DX cooling coil module
      • Chilled water coil module
      • Evaporative cooling module


      • 2" permanent filters
      • 1" disposable filters
      • 2" disposable filters
      • 2" 30% filters


      • TEFC
      • Premium Efficiency (three phase)


      • Low leakage opposed blade damper
      • Two position spring return actuator
      • Intake or discharge mounting
      • End switch


      • Fan service switch
      • Exhaust fan starter
      • Remote control panel
      • Remote control panel with indicator lights
      • Low temperature limit switch (freezestat)
      • Mild weather thermostat (inlet air sensor)
      • Clogged filter switch with indicator light
      • Convenience outlet (service receptacle)
      • Time delay relay
      • Time clock (seven day)
      • Smoke detector
      • Room override thermostat
      • High/low gas pressure switch
      • High gas pressure regulator
      • Flame failure relay
      • UV flame detection in lieu of flame rod
      • N/O vent valve
      • FM manifold
      • Control system diagnostic indicator
      • Maxitrol Series 44 space temperature control
      • Maxitrol DDC compatible control
      • Minnesota requirements


      • Chilled water coil, ARI 400 tested, copper tubes with aluminum fins
      • DX coil, ARI 400 tested, copper tubes with aluminum fins
      • Evaporative cooling with microprocessor controls


      • Propane in lieu of natural gas

      Contact the factory for any other options or accessories not listed.