A commercial disposal with a three inch trap has a fixture unit rating of __________?

A commercial disposal with a three-inch trap is assigned a fixture unit rating of 3. This rating is essential for plumbing design and calculations, as it helps engineers and plumbers determine the appropriate size of drainage and vent systems to accommodate the expected waste flow from the fixture.

The rating of 3 fixture units for a three-inch trap reflects the capacity of the trap to handle waste effectively while minimizing the potential for clogs or backups. Understanding fixture unit ratings is crucial for ensuring that plumbing systems are appropriately sized to handle all fixtures without overloading the drainage system.

The other options do not align with the established fixture unit ratings for a three-inch trap as defined in plumbing codes, which recognize the 3 fixture unit rating as adequate for the disposal's capacity.