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At 150 feet, a 2-1/2 inch pipe delivers ~730,000 BTU/hr, which is borderline. The UPC requires an upsizing safety margin, so a 3-inch line is required to safely carry 700,000 BTU/hr over this length. Correct answer: D. 3 inches.

UPC fixture requirements specify that showers must be trapped with a minimum 2-inch trap. This ensures the trap can handle sudden surges of wastewater from shower discharges without siphoning. Smaller traps (1-1/2 inch or less) are not permitted due to higher clogging risk and reduced capacity. Larger traps may be used if design requires, but 2 inches is the code minimum. Correct answer: C. 2 inches.

According to UPC drainage tables, a 3-inch building drain can carry up to 42 DFUs. Exceeding this load requires upsizing to 4 inches. Proper DFU assignment ensures sanitary operation and compliance with code. Correct answer: B. 42 DFUs.

At 70 feet, a 2-inch pipe can deliver ~850,000 BTU/hr, which is sufficient for a 750,000 BTU/hr load. A 1-1/2 inch pipe would be undersized. Correct answer: B. 2 inches.

According to UPC tables, a 2-inch vertical stack can handle a maximum of 16 DFUs. Beyond this, upsizing to 3 inches is required. Correct answer: C. 16 DFUs.