direct fired air heater

Q-PAK Direct Fired Air Heaters

The Q-Pak direct fired air heater is a robust direct fired air heater, ideal for heating air streams that can allow for mixing the products of combustion with the process air stream. The Q-Pak direct fired air heater utilizes an internally mounted raw gas duct burner located in the flow path of the process air stream. As the process air flows over the burner, it also supplies the combustion air necessary for the burner to operate. In applications where the air flow is not sufficient to maintain stable combustion, an external blower can be supplied. Fuel is piped into the burner, where it mixes with the process/combustion air. The resultant flame heats the air stream with very high efficiencies. 

The heater controls, fuel system, and junction box of the Q-Pak direct fired air heater are mounted on the heater providing interconnections to the heater for the fuel gas, pilot gas, pressure switches, low flow switch, flame scanner, igniter and thermocouple.  The control panel can be locally mounted on the heater, or shipped separately for remote mounting in the control area of your facility.  A process air blower motor starter can be supplied mounted to the heater and is wired to the motor and junction box. 

Q-PAK Direct Fired Air Heaters

The Q-Pak Oil Tool Heating System includes:

  • 3.0 MMBtu/hr (other sizes can be used as necessary) air heater with a recirculation duct system
  •  insulation
  • control valves
  • burner management system
  • recirculation blower
  • tool test enclosure


  • Automatic start-up of system
  • Fast heating and cooling
  • Precise modulating control of temperatures from 150 F to 1000 F
  • Safe burner management system meeting NFPA 85
  • System can be designed to match your existing or future facility
  • We fully test all of our systems



  • Designs from as low as 0.1 MMBtu/hr and up.
  • Efficiencies to 99%
  • Process Temperatures to 1000°F

The Process

The blower circulates the air through the Q-PAK air heater into the duct system to the tool test enclosure. In the tool test enclosure the heated air flows down to the bottom of the enclosure through an annular space between the outer housing and inner casing. The heater air then flows upward through the inner casing passing over the tool. The air exits the top of the tool test enclosure to the duct system where it is returned to the blower inlet. The system allows for recirculation of the air from the test enclosure to save on fuel costs. In the recirculation mode, 20% of the air flow will be exhausted and made up with fresh air. This keeps the oxygen level high enough for proper burner operation. There are three butterfly control valves in the duct system to control the recirculation of the air, exhaust air and fresh air. The valves have electric actuators that provide the option of using 100% fresh air and bypassing the recirculation mode.

Q-PAK Direct Fired Air Heaters Photo Gallery

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