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UPC drainage tables specify that an 8-inch horizontal branch may carry up to 960 DFUs. Exceeding this requires upsizing to 10 inches or more. Correct answer: C. 960 DFUs.

The UPC mandates indirect waste connections for fixtures where contamination could affect potable water or sanitary systems. Dishwashers, ice machines, and food preparation sinks must discharge through an air gap to an indirect waste receptor, preventing backflow into the appliance. Fixtures such as lavatories, bathtubs, and water closets connect directly because their risk profile differs. By requiring indirect waste piping, the code safeguards public health against cross-connection contamination. Correct answer: B. Dishwasher.

UPC drainage tables state that a 3-inch vertical stack can carry up to 84 DFUs. Vertical stacks can carry higher loads than horizontal branches due to gravity assistance. This capacity ensures that multiple fixtures from different floors can be supported safely. Exceeding this value requires upsizing to a 4-inch stack. Correct stack sizing is vital for maintaining hydraulic balance and preventing blockages. Correct answer: D. 84 DFUs.

UPC regulations require shower valves to deliver water at a minimum of 105°F and a maximum of 120°F. This ensures user comfort and hygiene while preventing scalding. Correct answer: B. 105°F.

The total load is 450,000 BTU/hr. At 80 feet, a 1-1/4 inch pipe can carry ~360,000 BTU/hr, which is insufficient. A 1-1/2 inch pipe delivers ~465,000 BTU/hr, making it the correct choice. Correct answer: C. 1-1/2 inch.