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  1. #1
    Join Date
    Oct 2018
    Location
    Tacoma, WA
    Posts
    2
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    Question ERV replacement?

    Hello,

    I am designing a mechanical plan for a small T.I. project. We are installing a mini ductless split system to serve an office & conference room. We were originally going to have an ERV system that serves the required outside airflow to the spaces but the permitting jurisdiction told me that the space would be except from DOAS requirements.

    My question is: How do I satisfy the required outside airflow rates without a DOAS system?

    The building is used as a warehouse. The proposed new office space is 900 SQ. ft. total, consisting of an open space, an office & conference room.
    Could we put a small ERV serving the open space and put transfer grilles connecting to the office & conference room?

    Thank you for any help.
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  2. #2
    Join Date
    Jun 2006
    Location
    Charlotte, NC area
    Posts
    112
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    Not sure of the weather conditions in the northeast, (I’m from the hot/humid southeast) but any time you bring in outside air in cool humid weather, it should be pre-conditioned to remove moisture. Anything else will lead to high humidity issues. Greenheck makes small ERVs for indoor and outdoor applications and Daikin makes a mini split type unit designed specifically for OA pre-conditioning. I'm sure other manufacturers have similar products.

  3. #3
    Join Date
    Oct 2018
    Location
    Tacoma, WA
    Posts
    2
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    Thread Starter
    Quote Originally Posted by hvac n-j-near View Post
    Not sure of the weather conditions in the northeast, (Im from the hot/humid southeast) but any time you bring in outside air in cool humid weather, it should be pre-conditioned to remove moisture. Anything else will lead to high humidity issues. Greenheck makes small ERVs for indoor and outdoor applications and Daikin makes a mini split type unit designed specifically for OA pre-conditioning. I'm sure other manufacturers have similar products.
    Thank you for the information. We are going to select a small ERV to serve outside air to the needed areas.

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