Make Up Air Heater

Series 78V

Hartzell’s Vertical Gas Fired Make Up Air Heater is an IRI pipetrain heater powered by 460-volt electrical input and natural gas.   Excellent for localized supply air applications.  A high velocity downblast discharge gets the heat to the floor where it’s needed most.   There is no expensive ductwork to install.  These heaters are designed for roof curb mounting and ready for connection to a gas line and power source.  Designed to be economical and energy efficient, the Make Up Air Heaters are also low-noise units that operate at 83 dBA or less at 5′.

The Gas Fired Make Up Air heater is an industrial-duty, direct-heating unit constructed with powder-coated, 12-gauge, hot rolled steel and cast aluminum alloy propellers.  Each direct-heating unit is a complete air supply system in a self-contained package, consisting of a fan, burner, three-place remote station and controls.  Each standard Make Up Air Unit comes with a bird screen and filter racks.

The units are accessible for easy maintenance.   With direct drive motors, Series 78V Make Up Air Heaters have no belts to adjust or replace. Extended lube lines to motors are included.

Additional Series 78V features:

  • Designed for natural gas or propane
  • 7,100 to 23,500 CFM at ¼” external static pressure
  • Heating capacities of 950,000 to 2,900,000 BTU/hr available
  • Controls are mounted and wired
  • Direct-drive fan arrangement; motor in airstream
  • Motors are totally enclosed
  • Extended lubrication lines to motors are standard
  • Cast aluminum airfoil propeller (adjustable pitch assemblies standard on 21,750 CFM units and up)
  • NEMA 4/12 enclosure
  • IRI control package is standard (also meets FM requirements)
  • NEMA 12 remote station
  • Maxitrol® 14 modulating temperature control is standard
  • Temperature-sensing elements mounted in airstream
  • High- and low-temperature limit control mounted within burner housing
  • Standard unit develops a maximum discharge temperature of 90°F (contact factory for optional discharge temperatures)
  • Motor-operated shutter
  • Access door for servicing is standard
  • Available with filters
  • Airflow proving switch
  • Fireye flame safeguard
  • Fused disconnect switch
  • High and low temperature controls
  • Mild weather thermostat
  • High and low gas pressure limits


Make Up Air Heater | Hartzell Air Movement

Specifications & Resources


0-1.5" s.p.
Heating Equipment