A condensate drain must slope 1/8 in. per ft for 64 ft. What total fall is required?
Correct Answer
A) 8 in.
Total fall is 64 ft x 1/8 in. per ft = 8 in.
Why This Is the Correct Answer
Total fall is 64 ft x 1/8 in. per ft = 8 in.
Why the Other Options Are Wrong
Option B: 4 in.
pipe slope fall, choice a: 4 in. is wrong because 4 in. implies about 6.25 percent fall over 64 ft; the stated slope is the one used in.
Option C: 6 in.
pipe slope fall, choice c: 6 in. implies about 9.38 percent fall over 64 ft; the stated slope is the one used in.
Option D: 12 in.
pipe slope fall, choice d: 12 in. is wrong because 12 in. implies about 18.75 percent fall over 64 ft; the stated slope is the one used in.
Memory Technique
Keep a anchor beside pipe slope fall: if one number is skipped, the option drifts away from 8 in.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use by topic index - M/P fallback to confirm that Total fall is 64 ft x 1/8 in.
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