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Hey it sounds like time for MATHMAN.

area of 2.5" circle is 4.9 sq. inches
25 1/2" holes is about the same area
a 1 foot by 1 foot piece of pegbd has 144 holes or about 9.5 times the area of the 2.5" hose attached to it. So if you make an air box that is 2 feet by 2 feet you have 38.4 times the area of the hose or like attaching a 12" hose to your shop vac. (holes have been increased to 1/2".)

BTW if you used the 1/8" holes you are at about a 3" hose area so the vaccume should be very close to what you get from the 2-1/2" hose. Has anyone tried that?

I've seen plans using a 30 gallon garbage can(metal) with hardware cloth (1/4" x 1/4" or 1/2" x 1/2") attached to a wood frame. That is then attached over the open can and a dust collector hose attached to a port high up on the can.

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