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  1. #1
    Join Date
    Nov 2011
    Posts
    33

    Media Filter Cabinet Sizing/Connection to Blower

    I noticed my Merv 16 filter (and filter box) in front of the furnace blower is bigger than the blower opening. I've wondered if a duct transition should be added, but don't want to go to the trouble unless really necessary. Any thoughts on whether this is a problem? Probably will run through the filter quicker since the top of the filter is not getting use, but I could live with that as long as I didn't cause air flow problems from having such a high performance filter and then not even having it set up where the whole filter will permit air flow.

    See the pic below (which is sideways...the furnace lays horizontal). The filter box is about 16x25 and I bet the furnace opening at the end is about 12x24.
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  2. #2
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,754
    its not perfect but with the spaces on each side of the filter in the cabinet it will use the whole filter area.

  3. #3
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,245
    What's done is done, its nothing to worry about. If I installed it I would have built a transition but If say I bought the house and the filter box was like that I wouldn't change it
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  4. #4
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,739
    Quote Originally Posted by unc99 View Post
    I noticed my Merv 16 filter (and filter box) in front of the furnace blower is bigger than the blower opening. I've wondered if a duct transition should be added, but don't want to go to the trouble unless really necessary. Any thoughts on whether this is a problem? Probably will run through the filter quicker since the top of the filter is not getting use, but I could live with that as long as I didn't cause air flow problems from having such a high performance filter and then not even having it set up where the whole filter will permit air flow.

    See the pic below (which is sideways...the furnace lays horizontal). The filter box is about 16x25 and I bet the furnace opening at the end is about 12x24.
    It looks like it's restricted at both ends of the filter cabinet. Just poor workmanship.
    What size A/C? What size (and how many) are the flex runs?

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