Final answer:
The maximum number of fixtures connected to a circuit vent or an additional circuit vent is typically subject to local plumbing codes and regulations. These codes might base on the fixture unit ratings, but it can vary. Always consult with local professionals to ensure compliance.
Step-by-step explanation:
The maximum number of fixtures connected to a circuit vent or an additional circuit vent is primarily subject to local plumbing codes and regulations. While the diameter of the circuit vent and the total fixtures in the building might impact the amount of fixtures that can be connected, it is local plumbing codes and regulations that often set the definitive rules and limitations.
These codes can vary by location, so it's important to confirm specifics with local building inspectors or plumbing professionals. These codes are set in place to ensure that the plumbing system operates effectively and safely, preventing issues like backflows or blockages.
For example, in some areas, the limit might be determined by the fixture unit ratings of the fixtures to be connected, not by the number of fixtures themselves. A fixture unit rating is a measure of the probable discharge into the drainage system by various types of plumbing fixtures. The higher the unit rating, the greater the capacity the vent should have.
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