is like bringing a Cub Scout to a heavyweight boxing match. It won't flow the big cfm heads at 28" H2O. So he flowed them at a smaller number of inches of water, I would guess either 7" or 10". He should have written down on the sheet of paper what pressure drop he was flowing at. If you see a number, such as 7" of H2O or whatever, give me that number and I will give you the conversion factor in order to convert those numbers to our commonly quoted 28" H2O.
Hope this helps,
Charlie
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