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Unavoidable drainage ditches, culverts, vents, ducts, and other openings should be protected by securely fastened welded

Posted: Fri Jul 22, 2022 11:17 am
by answerhappygod
Unavoidable drainage ditches, culverts, vents, ducts, and other openings should be protected by securely fastened welded-bar grills when they have a cross- sectional area greater than:

A. 10 square inches
B. 48 square inches
C. 64 square inches
D. 96 square inches
E. 04 square inches