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  1. 01-17-2009, 02:11 PM #1
    WhoIsThat?
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    HD 16x25x1 paper frame furnace filters

    Any suggestions on when to replace these, based on appearance or how bowed they become over time, or how well they pass light?

    It seems to me someone made an embedded whistle for filters of this type that would start to whistle when the upstream and downstream pressure delta was enough. Anyone know of a company that makes these?

    Thanks.
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  2. 01-18-2009, 12:10 AM #2
    grasshopper
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    Just change them monthly.
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  3. 01-18-2009, 11:20 AM #3
    WhoIsThat?
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    Quote Originally Posted by grasshopper View Post
    Just change them monthly.
    After two months they still look almost new.
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  4. 01-18-2009, 12:32 PM #4
    gary_g
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    Quote Originally Posted by WhoIsThat? View Post
    After two months they still look almost new.
    Then change them after 3 months. This is what I do, but I have no issues with poor air flow. I use the NaturalAire Standard pleated filters, MERV 8. The filter media is charcoal grey when I pull it out to be replaced (white when first installed).

    Take care.
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  5. 01-18-2009, 05:32 PM #5
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    Danimal535
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  6. 01-19-2009, 12:35 PM #6
    WhoIsThat?
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    let me rephrase. . .

    If they still look fine and are not bowed after 6 months and you can still sort of see through them, is there any reason to replace them? How 'bout after 12 months?
    Do filters clog up even if they look perfectly OK?
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  7. 01-19-2009, 01:26 PM #7
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    beenthere
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    If your waiting until they bow, your waiting TOO long!
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    How many times must one fix something before it is fixed?
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  8. 01-19-2009, 01:32 PM #8
    blade5009
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    How do you post questions on this site?
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  9. 01-19-2009, 01:33 PM #9
    WhoIsThat?
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    Quote Originally Posted by blade5009 View Post
    How do you post questions on this site?
    The same way I do. . .
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  10. 01-19-2009, 01:39 PM #10
    WhoIsThat?
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    Quote Originally Posted by beenthere View Post
    If your waiting until they bow, your waiting TOO long!
    Good.
    So, bowing (regardless of appearance or being able to see through it) indicates resistance to air flow and so it must be clogging up?

    Maybe somebody makes a furnace filter monitor based on pressure differential, light passing or the element being gradually bowed over time.
    Is the ultimate pass/fail standard the upstream/downstream pressure ∆?

    If I never replace a filter, the airflow will tend toward zero and the furnace high limit switch will open, yes?
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  11. 01-19-2009, 01:46 PM #11
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    beenthere
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    Honeywell makes a PD monitor.
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  12. 01-19-2009, 01:48 PM #12
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    beenthere
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    Quote Originally Posted by blade5009 View Post
    How do you post questions on this site?
    Go to the forum that that its description fits your question.
    Click on new thread.

    Type in topic.
    Then type in question.
    Then click submit new thread.
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    How many times must one fix something before it is fixed?
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