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Standpipe classes

In an unsprinklered building whose highest story floor level exceeds 30 feet above the lowest floor level which is accessible by fire department vehicle or the fire department, what class of standpipe is required per IBC?
I. Class I, II. Class II, III. Class III



Answer is III. Class III - a combination dry & wet pipe system equipped with both 1.5 and 2.5 outlets.

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