A combination drain and vent system is installed for a floor drain. According to the 2022 CPC, what is the maximum allowed fixture unit load for a 3-inch diameter combination drain and vent, and what is the exception based on pipe slope?

• 16 fixture units, except for floor drains which are limited to 8.
• 6 fixture units, with no exceptions.
• 8 fixture units, except the load can be increased by 50% if the horizontal branch is sized one pipe size larger.
• 12 fixture units, provided the vent is 2 inches.