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  1. #1
    Join Date
    Jul 2011
    Location
    Virginia
    Posts
    41

    Question about a kitchen hood

    I went to a restaurant yesterday because they complained the temperature in the restaurant and I noticed the restaurant is in a huge negative static pressure, the doors will not close from so much air trying to get into the restaurant (The doors close from inside out if you're wondering). I noticed the kitchen hood does not have a makeup air around the "lip" of the hood like I have seen at other restaurants. My question is how would I know how much CFM needs to be entered into the restaurant and what would be the best application in this situation.

    It will probably have to go on the roof but do I need a preheat system? Or is an outside air only unit OK to use? will this make the restaurant to cold in the winter?

    Any answer provided would be a big help. Thank You ALL

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,830
    Did you go on the roof? MU/air might be discharged into the conditioned space and maybe it is not working. Check your local codes as far as conditioning the air. Where I'm at, if the air is dumping into the hood it does not need conditioning. Anywhere else it does. You will need to do or have someone do an air balance to find out what needs to be done.
    Officially, Down for the count

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  3. #3
    Join Date
    Jun 2013
    Location
    Northern Ontario, Canada
    Posts
    639
    For commercial kitchens they usually want them in a slight negative pressure, just below the neutral pressure plane, this is so smells and smoke doesn't make it into the dining room. But you might have a make up air unit and the belt might be broken. You have to go on the roof to confirm, something so small can cause such a noticeable problem like door slamming shut. Also refer to local codes.

  4. #4
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    471
    I agree with RACMT. I see make up air belts torn up all of the time. Or the motor burns up....or the bearings break....

  5. #5
    Join Date
    Jun 2013
    Location
    Pennsylvania
    Posts
    31
    I would also check any mixing boxes or economizers. They might all be at 100 recirc, and the system requires more outside air. If they pulling in outside air, you may need to look into speeding up the units to bring in more outside air. One other solution is to slow down the exhaust on the kitchen hoods. They have a min CFM usually listed on the hood. I would double check what the hood is pulling VS the CFM it should be. Hope that helps.

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