Alphasonik FW1032 Owner's Manual - Page 11

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Converting a round port to a slot port.
Calculate the area of the round port(s) being used, then use the square
root function of your calculator to get the interior dimensions of an
equivalent suare port. The length (or depth) of the slot port will be the
same as that of the round port.
To calculate area: ( Area is a two dimensional measurement )
Circle =3.14 x Radius x Radius
Circle Port
Slot Port
4"
2"
2"
4" Port
2 x 2 x 3.14=12.6
1"
12.6 x 1=12.6
12.6"
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