Fan In A Can for Gas Systems up to 110,000 BTU (24V) Zoom

Fan In A Can for Gas Systems up to 110,000 BTU (24V)


Brand: Field Controls

Field Controls
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Product Type: Fan In A Can

Description for Field Controls CAS-4Jr

This product is designed for use with any natural gas or LP burning furnace, water heater, or boiler with a 750mV control system. It may be used with more than one appliance with the addition of a CK-81 Control Kit. The CAS unit mechanically draws air into a structure and disperses it near the combustion air intake of an appliance. If an optional Vacuum Relief Valve (VRV) is used, the incoming air is tempered before entering the structure's airspace. Refer to Diagram A and B for guidance in setting up the CAS system based on the size and length of the connecting duct-work and the input rating of the appliance.


  • Motorized Blower
  • 4" Galvanized Intake Air Hood
  • (2) Mounting Brackets to secure CAS to wall
  • (2) wire conduit connectors
  • 6" x 4" Pipe Reducer Fitting
  • 6" Orifice Ring
  • High/Low Motor Speed Switch

    Note: only use for 750MV Gas Systems up to 280,000 BTU

Fan In A Can for Gas Systems up to 110,000 BTU (24V)

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2 Questions | 4 Answers
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  • Fan In A Can for Gas Systems up to 110,000 BTU (24V)


    Te manual says to have the vent no less than 10 feet from an exhaust. I have the exhaust from the furnace about three feet from the corner of the building. My question is, can I have this intake vent arrround the corner from the existing exhaust vent, about two feet from the corner?
    Asked on 6/5/2012 by David

    3 answers



      My guess is you'll be fine but of course it would depend on wind direction.
      Nevertheless, I think you'll be OK.

      Answered on 6/5/2012 by Anonymous


      NO they should be in the same atmospheric zone, which is the same side of building and need to be ten feet apart regardles for fresh air dilution.

      Answered on 6/5/2012 by Anonymous


      I didn't have an exhaust vent so it wasn't an issue for me. However, I do
      not believe that it would be a problem for you since the intake and exhaust
      are on separate walls. Here is a diagram from the 2006 International Fuel
      Gas Code (which is what we are under here in Georgia). It shows the
      clearances necessary.
      Good luck,
      Bryan Dilworth

      Answered on 6/5/2012 by Anonymous
  • Fan In A Can for Gas Systems up to 110,000 BTU (24V)


    does this unit need direct electricity
    Asked on 2/20/2011 by spud from brooklyn,ct

    1 answer



      Like the other CAS units, it would need constant power.

      Answered on 2/21/2011 by Field Controls from NC
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