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    nugentoffer's Avatar
    nugentoffer Posts: 23, Reputation: 2
    New Member

    Jul 27, 2015, 08:47 PM
    Can you tell me how big this HVAC duct is? [pic]
    A portion of this duct has split in half in my attic, and I wanted to repair it with a new R6.0 duct. I just can't tell what size this is based on the tag. Is it 8'' or 10''?

    The tag says:

    Max. Velocity : 6000 F.P.M
    Max Pos. Pressure : 10 IN W.C.
    Max Neg. Pressure : 1/2 IN W.C.

    Thanks. Here is a link to the picture :
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
    Uber Member

    Jul 28, 2015, 12:11 PM
    That is a performance tag. 6,000 lineal feet of air per minute. 10" water column positive pressure, 1/2" negative pressure. I see a D 4338 so my guess would be 8"

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