The system spacing per head - 100 sq. ft. per head, for example - is the largest area created by the maximum spaces measured. In the case of the systems illustrated below, one has a spacing of 100 sq. ft. / sprinkler, but the other is 192 sq. ft. / sprinkler, based on the spacing along the walls, in the corner.

NOTE: This is an unformatted excerpt from our online fire protection training library.