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  1. #14
    Join Date
    Jul 2018
    Location
    Wisconsin
    Posts
    60
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    That is pretty much what is installed on new houses to meet fresh air requirements. 8 or 6 inch flex with a damper dumping into the return duct.

  2. #15
    Join Date
    Dec 2007
    Posts
    7,939
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    Quote Originally Posted by Spitz View Post
    That is pretty much what is installed on new houses to meet fresh air requirements. 8 or 6 inch flex with a damper dumping into the return duct.
    Depending on the requirements there may be no damper, just open all the time to the outside.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  3. #16
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    5,613
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    Its not uncommon around here to see unfiltered fresh air brought in.


    Sent from my iPhone using Tapatalk

  4. #17
    Join Date
    Sep 2014
    Location
    Portage, MI
    Posts
    116
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    Quote Originally Posted by Core_d View Post
    Its not uncommon around here to see unfiltered fresh air brought in.


    Sent from my iPhone using Tapatalk
    Pretty much all make up air is piped strait into the furthest point of the return. But it does all go through the furnace filter.

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