Page 1 of 2 12 LastLast
Results 1 to 13 of 19
  1. #1
    Join Date
    Mar 2007
    Posts
    7

    Make up air in the kitchen

    Hello,

    I have just finished my kitchen remodel and install a Wolf 48" gas range and a 48" 1100 CFM range hood. The problem I am having is that when I turn on the range hood...my family room smells like burned wood from the fireplace. To my knowledge, it seems like my house is pretty air tight and the range hood is pulling so hard, that the make up air is coming from the chimeny.

    Is there any way to make or buy something get get more air into my house?

    Any advise would be greatly appreciated.

    Thanks,

    Dante1

  2. #2
    Join Date
    Jun 2005
    Location
    The Gray Northwest
    Posts
    661
    Are you sure it's an 1100 cfm hood? That's a fair amount of air. I'm assuming this isn't a commercial kitchen? You're probably right about the chimney effect . If your house is air tight, that hood needs to get air from somewhere. First thing I'd do is find out why you have so much exhaust and if you could reduce that by at least half or better. Have you tried closing off your fireplace to confirm whether or not that's where the air is being drawn from?

  3. #3
    Join Date
    Mar 2007
    Posts
    7
    Thanks for the reply.

    Yes, I am sure it's 1100 CFM(Jenn Air #JXT9048CDP). The damper of the fireplace is closed but I guess it's not air tight. I don't think it would be wise the unplug one of the fans, if I am using the griddle or the char broiler...they will generate alot of smoke.

    Anything else I should look into?

    Thanks for your help,

    Dante1

  4. #4
    Join Date
    Sep 2002
    Posts
    3,708
    Closed all windows except for one.Open it half way.Tape some angel soft to
    it like a air curtain and turn on the the exhaust fan.

    Let us know how high the paper goes.

  5. #5
    home could be under negative pressure especially if HVAC system is running along with the hood fan?

    I would think cracking a window would help balance the pressure...

    Not sure if fresh air exchange systems are typically able to make up that much air?

    getting an HVAC pro onsite to take pressure readings with everything off, hood on, and hood/HVAC system on would be wise investment.

  6. #6
    you might also run test with fan off too and again with hvac system on.

    Quote Originally Posted by simpleman View Post
    Closed all windows except for one.Open it half way.Tape some angel soft to
    it like a air curtain and turn on the the exhaust fan.

    Let us know how high the paper goes.

  7. #7
    Join Date
    Mar 2007
    Posts
    7
    Simpleman,

    I tried your window test and since I have sliding windows, I basically taped a Scott towel to the screen and fired up the range hood. The Scott towel lifted to about 60 degrees. With the fan off and the AC off the Scott towel was flat on the screen.

    chandleraz_guy, your suggestion to get a pro here would be wise. Basically in Quebec, the utility companies pay $150.00 of the bill to get a company to do pressure test. They seal the house and attach a fan to the front door. Since it costs $300 and I get $150.00 kick back...I think it would be wise to get them here and tell me all the problems as far as air leaks.

    Thanks to everyone for answering my question. But is there a unit I can buy to generate more make up air?


    Dante1

  8. #8
    Join Date
    May 2005
    Location
    Lubbock Texas
    Posts
    773
    Most city codes on commercial kitchens require you to put back at least 80%of what is exhausted. I believe you are going to have to add a forced air make up with in 80% of the rated exhaust specs to stop any infiltration from the fire place. It needs to be brought in with a arms distance from the hood to be drawn back up the hood.

  9. #9
    Join Date
    Mar 2007
    Posts
    7
    Quote Originally Posted by genesis View Post
    Most city codes on commercial kitchens require you to put back at least 80%of what is exhausted. I believe you are going to have to add a forced air make up with in 80% of the rated exhaust specs to stop any infiltration from the fire place. It needs to be brought in with a arms distance from the hood to be drawn back up the hood.
    Thanks for the info. Can make up air be drawn from the attic? My kitchen is right below the attic.

    Dante1

  10. #10
    Join Date
    May 2005
    Location
    Lubbock Texas
    Posts
    773
    It would be best to draw it from outside the space of the house. If you draw from the attic space and have your HVAC unit in the attic it could effect how it drafts and give you problems during the winter with your heater.

  11. #11
    I think you're looking at an ERV or HRV to replace the air but your HVAC pro should be able to direction as well as the pros here.

    Warning ERV's are not cheap and can cost you a couple plasma TV's or more.

  12. #12
    For the money make sure you get a blower door test, pressure readings from all the rooms with doors closed, and flowhood test run for each of the major rooms. This should give you an overall picture of your airflow and any issues--I had it done not long ago and it was great piece of mind.

    Do you have HVAC return grills in each bedroom as many people (including me) have only 1 which creates a problem whenever those doors are closed.
    Quote Originally Posted by Dante1 View Post
    Simpleman,

    I tried your window test and since I have sliding windows, I basically taped a Scott towel to the screen and fired up the range hood. The Scott towel lifted to about 60 degrees. With the fan off and the AC off the Scott towel was flat on the screen.

    chandleraz_guy, your suggestion to get a pro here would be wise. Basically in Quebec, the utility companies pay $150.00 of the bill to get a company to do pressure test. They seal the house and attach a fan to the front door. Since it costs $300 and I get $150.00 kick back...I think it would be wise to get them here and tell me all the problems as far as air leaks.

    Thanks to everyone for answering my question. But is there a unit I can buy to generate more make up air?


    Dante1

  13. #13
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    I'm constantly amazed at how ignorant remodeling contractors are about the affect these 1000+ cfm range hoods, that are all the rage these days, have on the home.
    IMO, your remodeling contractor should have taken this into account from the beginning.

    That is a heck of a lot of air that needs to be made up, and will need to be a forced makeup air system. I'm no ERV expert, but I haven't seen any that will handle the kind of airflow you will need.

    IMO, you really don't need that much exhaust, probably not even half that much...
    If more government is the answer, then it's a really stupid question.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event