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  1. #1
    Join Date
    Aug 2003
    Posts
    907

    HEPA & MERV 11 vs cat litter box

    I hooked up the return grill near the cat's litter box to a HEPA filter with a MERV 11 prefilter (the manufacturer stopped making the MERV 12 claim). Guess what the MERV 11 prefilter didn't catch? The HEPA filter is now a strong yellow color... I'm only mildly allergic to that cat, but that's stuff I didn't need to breathe deep into my lungs. The small particles caught by the HEPA filter would have otherwise stayed suspended in the air for a long time...
    -If you won't turn it on then nothing else matters.

  2. #2
    Join Date
    Mar 2005
    Posts
    997
    I'd think even a merv 8 filter would take care of the dust because it is a large particulate. If dander is the issue then the heap would be best

  3. #3
    Join Date
    Jan 2008
    Location
    Canada
    Posts
    24
    What kind of HEPA system did you put in? Bypass or "HEPA"? I'm totally anti-cat, only because the litter box is always next to the furnace. Pets and HEPA don't mix well.

  4. #4
    Join Date
    Aug 2003
    Posts
    907
    It's independently ducted. The litter box sits 1 foot away from the register. The MERV 11 catches most, but not all.
    -If you won't turn it on then nothing else matters.

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