The maximum number of drainage fixture units allowed on the building drain or building sewer of a given size shall be in accordance with Table C304.2. The size of a building drain or building sewer serving a water closet shall be not less than 3 inches (80 mm).
For SI units: 1 inch = 25 mm, 1 inch per foot = 83.3 mm/m.
|MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS FOR SANITARY BUILDING DRAINS AND RUNOUTS FROM STACKS|
|SLOPE (inches per foot)|
- 1 On-site sewers that serve more than one building shall be permitted to be sized according to the current standards and specifications of the administrative authority for public sewers.
- 2 A maximum of two water closets or two bathroom groups, except in single-family dwellings, where a maximum of three water closets or three bathroom groups shall be permitted to be installed.