NATE Air Distribution Installation Practice Questions - NATE Air Distribution Installation Specialty Exam

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When sizing residential ducts with Manual D, the friction rate should generally fall within which range to avoid undersized or oversized ducts?

0.01 to 0.03 in. w.c. per 100 ft 0.06 to 0.18 in. w.c. per 100 ft 0.50 to 0.80 in. w.c. per 100 ft 1.0 to 2.0 in. w.c. per 100 ft

Correct Answer:

0.06 to 0.18 in. w.c. per 100 ft

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