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  1. #1
    Join Date
    Dec 2003
    Location
    Edgewater, NJ
    Posts
    88
    I have a Lennox CB31MV that takes 20" x 22 1/4" filters. I buy them on the net because I can't find them locally.

    The ones I normally get are pleated MERV 8. I recently saw a washable MERV 5 filter and wonder if it would be suitable.

    Thanks.

  2. #2
    Join Date
    Mar 2002
    Location
    Concord, CA
    Posts
    2,635
    Some IAQ hustler will inevitably contradict me 100%. But the lower grade filter is fine. Higher grade filters often do little for air quality. It depends on you environment and behavior. It takes a real commitment to actually improve air quality any significant amount. And if you're not worried about IAQ then don't worry about the machine. The washable filter will keep it happy unless you just happen to have a super dirty environment. Live behind a quarry? OK. In that case put in expensive filters.

  3. #3
    Join Date
    Mar 2004
    Posts
    1,042
    I agree with Irascible on the air quality comment. But be highly skeptical of washable filters; despite their claims, many of them are very restrictive of airflow through the system, which can cause inefficiency and equipment damage.

  4. #4
    Join Date
    Mar 2002
    Location
    Concord, CA
    Posts
    2,635
    U R right. I was thinking of "hog hair" type filters. The washable electrostatics are generally to be avoided unless the system is designed to handle the pressure drop.

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    I've heard a "wet coil" is a Merv 5 or 6 filter.If you don't want the coil to be the best filtering device in the system,go Merv 8 or better.You'll likely save on coil cleaning costs in the future.


    Signed.The IAQ Hustler!LOL

  6. #6
    Join Date
    Mar 2002
    Location
    Concord, CA
    Posts
    2,635
    Are you a duct cleaner Dash? I knew there was something wrong. Your love of the Carrier Kool-Aid wasn't enough to explain everything.

  7. #7
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    No duct cleaning here.



  8. #8
    Join Date
    Apr 2005
    Location
    Richmond, Virginia
    Posts
    365
    Wash it and hit it with some hair spray. The hair will act as a tactant, i.e., it will grab dust/dirt as it goes by.

    An old air balancer told me that trick.
    Sean Cantrell

  9. #9
    Join Date
    Mar 2002
    Location
    Concord, CA
    Posts
    2,635
    Originally posted by dash
    No duct cleaning here.
    Excellent. Then it's just a question of differing opinions (as opposed to arguing with the cognitively dissonant ).

  10. #10
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,931
    I am also a fan of the hogs hair washable filters. As long as they fit tight and are supported with a few wires run through them they hold up well and don't allow air to pass around their perimeter.

    I prefer having washable filters vacuumed unless they get really dirty where the dirt penetrates deep into the filter.

    Either way, I have found that a properly fitting and supported hogs hair filter to be the most forgiving as far as not restricting the air while still trapping impurities from the air.

    Hair spray is not a bad filter coating, but, filter coatings are really only needed on metal mesh type of filters. All filters made of any type of plastic/nylon material are in essence electrostatic and don't need to have a coating applied.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  11. #11
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Ira,

    So do you think the filter should be able to catch particles smaller then the coil will,or just clean the coil more often?This is irregardless of what Merv ,you or I may think it takes ,for the filter to be superior to the wet coil in filtering ability.


  12. #12
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,931
    I agree that the filter should catch any particulate that could be stopped by a wet coil. Since I has service contracts that included cleaning coils when needed, I did everything I could to keep those coils from getting dirty.

    My cleanest coils were ones that the systems had properly fitting hogs hair filters installed in. This includes the ones that I had installed electronic air cleaners that I also kept up on. The hogs hair filters have very little resistance even when dirty.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  13. #13
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    We find just about the opposite,pleated medias and EAC.s the coils are clean for years,if maintain/changed as needed .

    The Carrier hogs hair standard are the worst,though nobody coats them with filter spray that I heard of.


    With better filters there is also a lot less "stuff "growing in the pan,and drailine.

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