The following number and type of plumbing fixtures serve a condominium: two bathtubs, two water closets, two lavatories, one kitchen sink, and one dishwasher.
Assume the horizontal fixture branch serving these fixtures flows into a waste stack. Assume the vent stack extends through the roof and is 18 ft long. Determine the minimum pipe diameter required for:
a. The horizontal fixture branch
b. The waste stack at base of stack
c. The vent stack at top of stack