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Question 262 - CPP discussion
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
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