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  1. #1

    Minimum height for supply trunk line?

    Hello,
    Is there a minimum height-width ratio for a supply trunkline? I need to run about 140 in^2 through my trunk line and I'd prefer to do something like 4x35 rather than 6x24. Will that have any negative impact on my system?

    Thanks in advance!

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,599
    Yes, it won't move the air like you think it will.

    Your contractor should know this. And know what ratio he can use.
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    How many times must one fix something before it is fixed?

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