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S&P Adjustable Interior Air Inlet Valve

$20.28 - $45.14
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Product Reviews

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  • Circular Interior Air Inlet Valve
  • Available for 4",5",6" and 8" applications
  • Adjustable grills
  • Available in plastic or metal
  • Ships via UPS
  • Click to view S&P kitchen fans
  • Click to view S&P bathroom fans


These interior air inlet valves by S&P are made for bathrooms or other small rooms. All models offer an adjustable central valve to regulate the air flow. The inlet valves are available for 4",5",6" and 8" applications. These adjustable air inlet valves are available in metal or plastic to suit any setting. These air inlet valves ship via UPS.

Ship Method:

    Ships via UPS/FedEx Ground

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Product Reviews:
Good, simple design, if a little expensive.
by: A. Butler     from: Ann Arbor, MI      on: November 9, 2010
 Bought and installed one of these through drywall in a bathroom wall a couple weeks ago. Item includes three pieces total: 1) a flange with three screw holes that fits through the hole in the wall and includes a rubber gasket on the back to fit snugly into the duct

Your questions that we answered:
Is this a check valve that only allows airflow in one direction or is this just a register for the inlet to a vent fan. I have heard the term "air inlet valve" in plumbing to refer to a valve that allows air into but not out of a sewage drain. I am looking for a large (8") air check valve that only allows flow in one direction.   - Asked about product SL-BOR-200
 SL-BOR-200 is an adjustable valve that will vary the air flow. A backdraft damper will allow
the air to flow in but 1 direction. The 8" backdraft damper is needed would be SL-CAR200:

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    This item(s) is also sometimes listed under the following manufacturer numbers:

    BOC100, BOC125, BOC150, BOC200, BOR-100, BOR-125, BOR-150, BOR-200

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