Perforated Metal


Formulas for DeterminingPercentage of Open Areas

Staggered Round Holes
= %
Straight Round Holes
= %
Staggered Square Holes


= %
Round End Slot
= %
Square End Slot


= %
Straight Square


= %
To Find the Holes Per Square Inch:

H.P.S.I =(% Open Area)/78.54 x D2

 
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