IFX

IFX

Four Pass Indirect Fired Duct Furnaces

The indoor IFX Duct Furnace offers complete flexibility to the engineer and owner to meet any design need. Controls can be set up for space heating, make-up air or a combination of both. The standard four pass indirect fired duct furnace is a horizontal-suspended unit.

IFX series duct furnaces have nominal heating capacities from 312,500 to 7,500,000 BTUH (input) and air handling capacities from 2,300 to 81,000 CFM.

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Indirect Fired

Features

  • Unit designed for mounting in-line in ductwork with upstream air handler by other manufacturers.
  • The indirect fired heater is a two section, four pass, configuration. Both sections are manufactured of series 400 stainless steel.
  • Flanges are provided for connection to ductwork and all control, gas piping, and induced draft fan are designed to remain outside the ductwork.
  • Cabinet is designed for suspension from the top and includes lifting lugs.
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4-Pass Drum and Tube Heat Exchanger

Maximum Heat Transfer Surface Area

The Applied Air IFX system 4-pass heat exchanger consists of a large primary section and a secondary section of multiple tubes depending on the capacity you require. The sections are connected via collector boxes at the ends of each pass. The primary section of the heat exchanger is manufactured of 400 series stainless steel and secondary section is manufactured of mild steel {standard} or 400 series stainless steel {optional}. The primary section is rolled, and seam welded in the Mestex factory in Dallas. All seams are continuous welded in the factory and tested for leaks. The primary section has a pressure relief and visual inspection port. The secondary section includes a condensation drain port.

Drum and Tube Heat Exchanger
power burner

Powered Combustion Burner

Efficient Air/Fuel Mixing and Combustion

The combustion burner has an integral blower and motor, air proving switch, and pilot assembly. There is also a combustion air damper that is interlocked with the gas control valve in order to produce the proper air/fuel mixture throughout the operating range.

Factory Assembled Gas Train

Tested and Ready to Fire

The factory wired and assembled gas train consists of low pressure gas regulator, motorized gas control valve, main gas shutoff valve, pilot pressure regulator, and pilot gas shutoff valve.The burner controls can be On/Off, Hi/Low/Off, or Fully Modulating.

HeatExchanger_0134
induced draft fan

Induced Draft Fan

Venting Combustion Products to the Atmosphere

A direct drive motor spins the fan in the induced draft assembly and vents the combustion products to the atmosphere. The entire assembly (less the moror itself) is manufactured in the Dallas factory. The fan is of a non-clogging, radial blade design. The assembly also includes a manual damper with locking quadrant so that it can be adjusted during the startup process to assure proper induction.