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Negative air pressure problem. Any suggestions??

  • 13-11-2014 1:15pm
    #1
    cameramonkey
    Closed Accounts Posts: 3,220 ✭✭✭


    The problem I have is in a small restaurant. There are two rooms, one a kitchen with a commercial extraction system, the other room is the eating and serving area and the two are connected by swinging door.

    The Dining area is heated by two electric heaters that are sufficient to heat the space. However when the kitchen extraction system is turned on all the heated air is pulled from the dining area into the kitchen area. The air in the dining area is replaced by cold air coming through the front door when open or through small spaces that are not sealed. I can even feel a draught coming through the socket holes. This means that the dining area then becomes cold.

    If I open the back kitchen door the airflow from the dining area is stopped and the dining area again heats up. However For health and saftey reason and for comfort for staff(it gets cold) I cannot have the kitchen area back door open.

    My question is how do I counteract this negative pressure issue in the kitchen. Is there a system or piece of equipment that I could use to equalise the pressure in the kitchen and stop the flow of air from the dining area?


Comments

  • #2
    Robbie.G
    Registered Users, Registered Users 2 Posts: 1,884 ✭✭✭Robbie.G


    cameramonkey wrote: »
    The problem I have is in a small restaurant. There are two rooms, one a kitchen with a commercial extraction system, the other room is the eating and serving area and the two are connected by swinging door.

    The Dining area is heated by two electric heaters that are sufficient to heat the space. However when the kitchen extraction system is turned on all the heated air is pulled from the dining area into the kitchen area. The air in the dining area is replaced by cold air coming through the front door when open or through small spaces that are not sealed. I can even feel a draught coming through the socket holes. This means that the dining area then becomes cold.

    If I open the back kitchen door the airflow from the dining area is stopped and the dining area again heats up. However For health and saftey reason and for comfort for staff(it gets cold) I cannot have the kitchen area back door open.

    My question is how do I counteract this negative pressure issue in the kitchen. Is there a system or piece of equipment that I could use to equalise the pressure in the kitchen and stop the flow of air from the dining area?

    The simple answer is if your extracting air you need to replace it so best is to put ventilation into kitchen by means of wall vents or whatever other means are feasible


  • #3
    cameramonkey
    Closed Accounts Posts: 3,220 ✭✭✭cameramonkey


    Robbie.G wrote: »
    The simple answer is if your extracting air you need to replace it so best is to put ventilation into kitchen by means of wall vents or whatever other means are feasible

    How would I heat this air coming in?


  • #4
    corkgsxr
    Registered Users, Registered Users 2 Posts: 3,404 ✭✭✭corkgsxr


    cameramonkey wrote: »
    How would I heat this air coming in?

    If you put vents low in the kitchen the extractor sucks air in these and not the warm air in the dining area


  • #5
    antoinolachtnai
    Registered Users, Registered Users 2 Posts: 9,814 ✭✭✭antoinolachtnai


    There is very good advice above.

    The other small thing I'd wonder is whether the commercial air extraction system in the kitchen is running at too high a speed, at least some of the time.


  • #6
    cameramonkey
    Closed Accounts Posts: 3,220 ✭✭✭cameramonkey


    corkgsxr wrote: »
    If you put vents low in the kitchen the extractor sucks air in these and not the warm air in the dining area

    The side wall are abutting buildings next door and the back wall has a big cold room so my choices are very limited for vents.
    antoinolachtnai wrote: »
    There is very good advice above.

    The other small thing I'd wonder is whether the commercial air extraction system in the kitchen is running at too high a speed, at least some of the time.

    The chefs say the system is running at normal speed and pressure.The kitchen was just done up and maybe its is just too air tight.


    Thanks you both for your suggestions.


    I was thinking of using one of these on the roof. anyone ever used one?

    http://www.ggmgastro.com/radialventilator-4500m-pro-std-fur-airboxen.html?___store=ireland&___from_store=default


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  • #7
    KK4SAM
    Registered Users, Registered Users 2 Posts: 735 ✭✭✭KK4SAM


    That's a large volume of air turnover per hour ,The volume of say a Basket ball court every hour.
    As suggested earlier this needs a source of fresh air rather than cooling the dining area.
    A speed controller may be a solution. ?
    Were there any filters cleaned of removed recently ?


  • #8
    cameramonkey
    Closed Accounts Posts: 3,220 ✭✭✭cameramonkey


    KK4SAM wrote: »
    That's a large volume of air turnover per hour ,The volume of say a Basket ball court every hour.
    As suggested earlier this needs a source of fresh air rather than cooling the dining area.
    A speed controller may be a solution. ?
    Were there any filters cleaned of removed recently ?

    Thanks.

    It(extractor fan) is cleaned regularly but the problem does not change, as I said if I leave the back door open it is fine but at this time of year the cold air makes things uncomfortable in the kitchen.


  • #9
    MicktheMan
    Registered Users, Registered Users 2 Posts: 2,858 ✭✭✭MicktheMan


    cameramonkey wrote: »
    Thanks.

    It(extractor fan) is cleaned regularly but the problem does not change, as I said if I leave the back door open it is fine but at this time of year the cold air makes things uncomfortable in the kitchen.

    Can you not run a ducted fresh air supply from outside terminating close to the extractor


  • #10
    cameramonkey
    Closed Accounts Posts: 3,220 ✭✭✭cameramonkey


    MicktheMan wrote: »
    Can you not run a ducted fresh air supply from outside terminating close to the extractor

    Thanks

    Hi, was thinking about that as a solution. I think that is possibly the way To beat the problem. If I do this will this affect the amount of air being pulled away from the cooking station because of this extra air being introduced close to extractor?

    Who would I get to do this in Dublin?


  • #11
    MicktheMan
    Registered Users, Registered Users 2 Posts: 2,858 ✭✭✭MicktheMan


    cameramonkey wrote: »
    Thanks

    Hi, was thinking about that as a solution. I think that is possibly the way To beat the problem. If I do this will this affect the amount of air being pulled away from the cooking station because of this extra air being introduced close to extractor?

    Depends on how it is done / layout of kitchen/cooking station etc, i.e. someone would need to survey it to offer a solution. You will also need to think about condensation dripping, so insulated ducting should be considered.


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