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Perforated Duct Hole Sizing/Spacing

Perforated Duct Hole Sizing/Spacing

Perforated Duct Hole Sizing/Spacing

(OP)
I am attempting to size/space perforations (holes spaced along the length) in an exposed duct to provide even air supply at each hole.  I have seen another post on the subject, but do not follow exactly the procedure used.  I have a 150' long 43" dia. duct with 15,000 cfm, and therefore a starting velocity of 1500 ft/min.

Can anyone direct me to a design guide or give me a small example of how to size a portion of the duct holes?

I haven't located any help in ASHRAE.  Thanks so much for any help you can provide!

RE: Perforated Duct Hole Sizing/Spacing

Consider ductsox
or see United sheetmetal, they have some pre-perforated ducts.

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