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  1. #1

    passive fresh air vent with damper

    Is anyone aware of a passive fresh air vent unit that has a damper inside which will allow outside make-up in but keep conditioned air from escaping? In other words, one that will only open when there is negative indoor air pressure?

  2. #2
    Join Date
    Mar 2007
    Sterling Heights, MI

    Combustion Air

    Field Controls ( makes several products to make up air. Look under Contractor Products, Combustion Air and scroll down to Makeup Air System. The style you refer to is a MAS 4 or 6, meaning 4inch or 6inch., which will open under negative conditions. Look at their great information and new training area too!

  3. #3
    Join Date
    Jul 2006
    NW burbs of Detroit
    These are easy as pie

  4. #4

    Post thanks

    thanks for the tip

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