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  1. #1
    Join Date
    Mar 2019
    Posts
    2
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    Make up air calculations

    I looking for an easy calculation formula to determine how much make up air I need in a room.

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    7,863
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    How much are you exhausting?
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  3. #3
    Join Date
    Mar 2019
    Posts
    2
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    Thread Starter

    Make up air calculations

    Quote Originally Posted by 2sac View Post
    How much are you exhausting?
    I'm taking a test and need a formula.

  4. #4
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    5,787
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    What is the room used for?

  5. #5
    Join Date
    Apr 2010
    Location
    California
    Posts
    616
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    Hello, and Welcome! I see you are an "HVAC/R Contractor", "Is that Correct"?
    "Please Splain That"? op

  6. #6
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    24,153
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    No one will be able to help you until you answer the questions in posts 2 & 4.

    I've seen areas that needed no fresh air, and others that needed 100% fresh air.


    Quote Originally Posted by Shadow55 View Post
    I looking for an easy calculation formula to determine how much make up air I need in a room.
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

    Did you really need the " If you were a real tech " ??

  7. #7
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,035
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    Quote Originally Posted by Shadow55 View Post
    I looking for an easy calculation formula to determine how much make up air I need in a room.
    Start with 100% and adjust as needed!

  8. #8
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    9,473
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    Quote Originally Posted by pecmsg View Post
    Start with 100% and adjust as needed!
    But what if the room needs to be under negative pressure?

  9. #9
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,035
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    Quote Originally Posted by BNME8EZ View Post
    But what if the room needs to be under negative pressure?
    Bigger Exhaust!

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