Building a Flow bench

[TVS]

> Goes a little bit further. Basically--there is no way you are gonna may 25
> to 33 inches of H2O pressure air  (33 allows for some ducting and
> measurement losses) with ANY kind of a standard fan or blower wheel. You
> are going to need multiple (compounded) fans OR, as I said, a regenerative
> blower. End of story.

Yes, I believe it is quite acceptable to test the flow at a more manageable
pressure drop, say 5" of H20 and then standardise the flow rate to 25" of
H20. This can of course simply be done by multiplying the flow by the square
root of the ratio of pressures.
Toby

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TKMVS at Bigfoot.com
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