enclosure port

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square inch is a measurement of area
a circle with an area of 25 square inches is :
Area=pi*diameter^2/4
rearrange:
sqrt(4*Area/pi)=diameter
For your area of 25 square inches, the diameter is 5.64 inches, or 14.3 cm.

It is hard to make a round port a specific size, so you can scale your length, based on available port diameters.
L1/L2=A1/A2, where L1, A1 are the original length and area, and L2,A2 are the new length and area...
rearranging again, and Realizing that area is proportional to diameter squared, and entering your port data:
L2=15*(Diameter^2/5.64^2)

You input the diameter of the ports you can get, and from that you can get the new length.....
 
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