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  1. #1
    Join Date
    Oct 2012
    Posts
    91

    Need education on Make-Up Air & Vent Hood

    We are in the make-up air talking stages with our builder & I need some talking points to take with me when he & I discuss:
    Our 4 burner gas range + make-up air in relation to the 600 CFM hood & Dehumidifcation.

    So I think the current plans for the make-up in regards to the hood is something like this:

    1) Passive makeup air duct rather than a powered makeup air unit.
    2) Duct includes a motorized damper that is wired to come on simultaneously with the range-hood fan like Broan MD8T or Broan MD8TU (not sure differences)
    3) Broan recommends installing an outdoor air duct connected to a grille mounted on the kitchen wall
    or
    3a) Connected directly to the return plenum of your furnace; the motorized damper is installed in the duct.
    4) One 8-inch-diameter duct works for a range hood rated up to 1,000 cfm.

    Question are:

    1) Which method is prefer #3 or 3a?
    2) How does this play into the most cost efficient dehumidification strategy in the reports below (pgs. 8 of first link & pgs. 17 +48)?

    a) http://www.buildingscience.com/docum...ntrolling-cost

    b) http://www.buildingscience.com/docum...search-results

  2. #2
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,295
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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