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  1. #1
    Join Date
    Jan 2005
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    What experience does anyone have with the loop by pas hepa filters that are added to the return air ducts?

  2. #2
    Join Date
    Apr 2004
    where you at?
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    what about the remaining 75% air volume that does not by-pass?

    too expensive - both purchase and maintenance (HEPA replacement, power draw, ext.), with little gained.

  3. #3
    Join Date
    Apr 2002
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    Seen the fan powered ones where they draw air 'upstream' from return duct, filter it and blow it back 'downstream' into the return duct closer to the furnace/air handler. They even come with VS motors.

    Expensive, but with the fact that HEPA filters are restrictive to start with and could have a change out pressure drop as high as several inches, the bypass would be the way to go if you wanted that level of filtration.

    If it was like a blind pepsi taste test, I don't think the most hypochondriac (sp?) HO could tell the difference between a HEPA system or a good media air cleaner.
    The way we build has a greater impact on our comfort, energy consumption and IAQ than any HVAC system we install.

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