Fixture clearance, connection, and venting requirements for common plumbing fixtures tested on licensing exams.
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- Minimum clearance in front of a toilet for proper access
- 18 inches from the center line to any wall or fixture
- Minimum bathroom width when a toilet is present
- 30 inches
- Minimum side clearance on each side of a toilet
- At least 15 inches from toilet center line to any wall
- Minimum clearance in front of a pedestal sink
- 18 inches
- Minimum counter depth clearance in front of kitchen sink
- 24 inches
- Minimum side clearance for each side of a bathtub
- At least 12 inches on each side
- Minimum clearance required in front of a shower stall
- 24 inches
- Minimum trap seal depth required by code
- 2 inches
- Maximum trap seal depth allowed
- 4 inches
- Required slope for drain lines and trap arms
- 1/4 inch per foot of horizontal run
- Maximum slope allowed for horizontal drain lines
- 1/2 inch per foot
- Maximum distance from fixture trap to vent opening
- 8 feet measured along the trap arm
- Minimum height vent pipe must extend above roof
- 12 inches
- Minimum distance from vent terminal to windows, doors, or air intakes
- 10 feet horizontal distance and 3 feet above the opening
- Type of fitting required when connecting fixture drains to main stack
- Sanitary tee or wye fitting; never 90-degree elbow
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