What does OPI stand for?

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Chicago style: Acronym Finder . S.v. "OPI." Retrieved May 22 2013 from <a href="http://www.acronymfinder.com/Openings-Per-Inch-(-air-filter-mesh-grades)-(OPI).html">http://www.acronymfinder.com/Openings-Per-Inch-(-air-filter-mesh-grades)-(OPI).html
APA style: OPI. (n.d.) Acronym Finder. (2013). Retrieved May 22 2013 from <a href="http://www.acronymfinder.com/Openings-Per-Inch-(-air-filter-mesh-grades)-(OPI).html">http://www.acronymfinder.com/Openings-Per-Inch-(-air-filter-mesh-grades)-(OPI).html

Openings Per Inch ( air filter mesh grades)

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Samples in periodicals archive:

8 openings per inch choose the abrasive grains with a diameter of roughly 2 millimeters.

allowing many more openings per inch than are possible by drilling conventional 0.