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  1. 09-07-2009, 08:55 PM #1
    ColdInSeattle
    ColdInSeattle is offline New Guest
    Join Date
    Sep 2009
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    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!
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  2. 09-07-2009, 09:16 PM #2
    beenthere's Avatar
    beenthere
    beenthere is offline Global Moderator
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    Jan 2004
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    Lancaster PA
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    62,203
    Yes, it won't move the air like you think it will.

    Your contractor should know this. And know what ratio he can use.
    Contractor locator map

    How many times must one fix something before it is fixed?
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