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