Effective Opening (ef•fec•tive o•pen•ing)

1. The minimum cross-sectional area at the point of water supply discharge, measured or expressed in terms of: (a) the diameter of a circle, or (b) if the opening is not circular, the diameter of a circle of equivalent cross-sectional area.

2. For faucets and similar fittings, the effective opening shall be measured at the smallest orifice in the fitting body or in the supply piping to the fitting.

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