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  1. #1
    Join Date
    Aug 2011
    Posts
    24

    re: washable filters: tell me why they are awful

    Personally I have always used standard media in my furnace, but that is not what this post is about.

    It seems to be a consensus here that washable filters are awful.

    Ok. But I want to understand as many reasons why they are awful in comparison to other media.

    1. Do they increase pressure drop? Is the airflow decreased through the filter? is this have to do with a non-pleated surface area?
    2. How often are these filters cleaned in comparison to the standard 3 month for media.?
    3. I have read here that degrade over time. how does this happen?
    4. are advertised MERV values inflamed?

    tell me some other reasons why these things are awful.
    thanks
    -mtbike

  2. #2
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,371
    Homeowners don't wash them as often as needed, they are too coarse to effectively filter the air.

  3. #3
    Join Date
    Aug 2011
    Posts
    568
    they sell them to save you money, reality they cost you money!

  4. #4
    Join Date
    Sep 2002
    Posts
    2,776
    They only stop birds from going thru your unit !

  5. #5
    Join Date
    Aug 2011
    Posts
    568

    Confused

    Quote Originally Posted by coolperfect View Post
    They only stop birds from going thru your unit !
    along with the air!

  6. #6
    Join Date
    Oct 2004
    Location
    So Cal
    Posts
    3,545
    Quote Originally Posted by coolperfect View Post
    They only stop birds from going thru your unit !
    Pepsi all over my monitor.
    That was good!

  7. #7
    Join Date
    Jun 2007
    Location
    So Cal
    Posts
    101
    Hmm, I've read on these boards that the thin ones that come in Rheem furneys clean the air better'n the cheapie fiberglass ones. That untrue? And when you consider the manu's don't really like the paper pleated ones, cuz they're so restrictive... I don't have a prob with washables.

  8. #8
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,721
    there are 2kinds of washable filters the metal mesh ones and the plastic mesh ones and the metal one is worthless and the plastic one are very restrictive.

  9. #9
    Join Date
    Aug 2011
    Posts
    568

    Thumbs up

    Quote Originally Posted by rChris View Post
    Hmm, I've read on these boards that the thin ones that come in Rheem furneys clean the air better'n the cheapie fiberglass ones. That untrue? And when you consider the manu's don't really like the paper pleated ones, cuz they're so restrictive... I don't have a prob with washables.
    actually those rheem ones i like, approved by the mfg. the ones from the box stores don't like!

  10. #10
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,721
    Your talking about the ones that come with the units they are ok . I was referring to the electrostatic washable filters.

  11. #11
    Join Date
    Jan 2008
    Posts
    2,057
    If you really have any inclination at all about getting the right type of filter for your system, have a pro come out to evaluate your static pressure, and ask him if he can fit in a Honeywell, Air Bear or April Air media air cleaner to your system.
    Don't waste your time with an electronic air cleaner, or washable filter.
    Get a good media air cleaner, and you'll never need your coil cleaned if you change the media when needed.
    Keep in mind, the filter is not there to clean the air in your home. It's there to protect the equipment from dirt and dust.
    If you have special needs for indoor air quality, there are whole house air cleaning systems for that job.
    "Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler

  12. #12
    Join Date
    Feb 2006
    Location
    Float'N Vally, MS
    Posts
    1,841
    Quote Originally Posted by rChris View Post
    And when you consider the manu's don't really like the paper pleated ones, cuz they're so restrictive...
    I really, really have a problem with this statement

    It's like saying all small cars ride terrible. I've been in some Beemers (small car to me) that ride great!

    Size does matter!

    The reason "some" manufacturers state pleats are toooo restrictive is because MOST installations returns and filters are undersized. So yes pleats in those conditions are too restrictive, put in poly or fiberglass.

    Most professionals CAN design a system where 1" pleats are not restrictive ( for residential).

    ASHRAE does have guidelines on filter loading and performance.

    Size does matter...

    Or use 4" pleats.
    Now I am off my soap box... necermind.
    Life is too short, Behappy!
    TFMM

  13. #13
    Join Date
    Feb 2010
    Location
    Ontario Canada
    Posts
    1,341
    I have been using an electrostatic air filter for over 10 years. As long as it is cleaned monthly I have no problems. It does as advertized.
    Never give up; Never surrender!

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