I don't have a feel for 100cfm but it sounds like a lot, especially to
shove through 5 3/16" holes.
The term "air blast" is mostly figurative. Most of the time you need
just a little more than a gentle breeze (as felt coming out of the empty
Mine has probably 25 1/4" holes in an area 2 1/2" across.
No. The more holes the better. Bigger holes would be nice too. Somewhere in
my reams of airplane stuff is a three page formula on ducts and airflow
having to do with jet engines. It seems to apply here, dealing with duct
opening area and volumetric effeciency. Think about getting at least 50% of
your duct output area into the hole area, or you're just wasting blower power
against a steel wall. Volume is the key, not velocity. Hope this helps...
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