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  1. #1

    air supply inlet

    What is the difference between nonmechanical and mechanical air supply?

    I am investigating purchasing a tankless water heater. When deciding location, horizontal vent location appears to be a big issue.

    The distance between the HVAC air supply inlet and the water heaters concentric, combustion air inlet differs between mechanical and nonmechanical systems.

    My HVAC unit is in the basement. I have a duct (?fresh air?) going from outside to the return plenum before the filter. Would this be considered a nonmechanical air supply inlet?

    Thank you.

  2. #2
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,744
    Quote Originally Posted by Glevin View Post
    What is the difference between nonmechanical and mechanical air supply?

    I am investigating purchasing a tankless water heater. When deciding location, horizontal vent location appears to be a big issue.

    The distance between the HVAC air supply inlet and the water heaters concentric, combustion air inlet differs between mechanical and nonmechanical systems.

    My HVAC unit is in the basement. I have a duct (?fresh air?) going from outside to the return plenum before the filter. Would this be considered a nonmechanical air supply inlet?

    Thank you.
    Non-mechanical. That (fresh air) can be omitted, if you think your house is loose enough.

    We (at one time) had to install fresh air intakes (new construction) here to be in code.

    But now we don't when they figured out the homes were already loose as a goose.

    It'll depend on how tight your house is.

  3. #3
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    Dec 2002
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    SouthEast NC ICW & Piedmont Foothills
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    1- you gotta read first


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  4. #4
    Thanks for the help

  5. #5
    Join Date
    Nov 2010
    Location
    Andover Kansas
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    Welcome to the site.
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