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  1. #1
    Join Date
    May 2004
    Location
    Indiana
    Posts
    48

    Merv 8 vs. Merv 11

    Hi all!
    I have a question about filters and Merv ratings.

    I have been using a Merv 8 filter. The filter box installed actually holds a 4" filter not 5" which is more common to find. The only 4" filter I can find is a Merv 8 rating. (filter size is 20x24x4)

    Here is my question...can I use 2 - 2" Merv 11 filters? This would also actually help me out in another way in that the filter box is in a tight area and it is challenging to jimmy in the 4" filter.

    Thanks for thoughts on this.
    Last edited by hvac_help_needed; 08-13-2007 at 08:53 AM. Reason: added filter size

  2. #2
    Join Date
    Sep 2006
    Posts
    688
    Bad idea. You double the pressure drop without really increasing efficiency.

  3. #3
    Join Date
    Jun 2005
    Location
    The Gray Northwest
    Posts
    661
    A 4" deep filter is pretty common in commercial buildings. Look up filter companies in the yellow pages or on line.

  4. #4
    Join Date
    May 2004
    Location
    Indiana
    Posts
    48
    Thanks...I will keep looking.

  5. #5
    Join Date
    Sep 2006
    Posts
    688
    Do a Google search for: "MERV 11 4 inch filters."

    At the risk of shameless self-promotion go with the first hit.

    If you order from them and have any problems, let me know.

  6. #6
    Join Date
    May 2004
    Location
    Indiana
    Posts
    48
    Quote Originally Posted by breathe easy View Post
    Do a Google search for: "MERV 11 4 inch filters."

    At the risk of shameless self-promotion go with the first hit.

    If you order from them and have any problems, let me know.
    Thanks for the help! No shame in helping others!

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