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  1. #1
    Join Date
    Jan 2009
    Posts
    20

    Electronic Air Filter Size

    I have a 4 ton unit, just curious what size electronic air filter I should be looking at. I am interested in the Honeywell F300e model.

    Is a 16x25 to small? Is a 20x25 to big?

    Thanks,

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,791
    The 25 x 16 is rated for a max 1400CFM.

    You want the 20 x 25.
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  3. #3
    Join Date
    Jan 2009
    Posts
    20
    Looks like my HVAC guy has a slightly used 16x25 one for a great price....

    Is there an downfall to putting in the 16x25 vs the 20x25 for my 4 ton unit?

  4. #4
    Join Date
    Jan 2004
    Location
    PA
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    68,791
    Won't filter as good as you want.

    So it kind of defeats the purpose of having it.
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  5. #5
    Join Date
    Jan 2009
    Posts
    20
    Beenthere,

    Just curious, why won't the 16x 25 electronic filter as well? Too much air going through it?

    My blower is a 2000 cfm blower, the 16X25 filter allows 1400 cfm, is this a problem? Will this "choke" the system?

    Am I getting confused with this system? Will the blower only get 1400 cfm of air to push with the 16x25?

    Thanks,

  6. #6
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,791
    The velocity will be too high, for the filter to be effective.

    Like a car that is rated at 30 MPG on the highway.
    Thats at a speed of say 65MPH. Drive it at 90MPH, and you'll be lucky to get 18MPG.
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