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What is NYC FGC § 504.3.9?

Quick Answer

This section mandates that the opening size of tee or wye fittings connecting to a common vent must match the size of the common vent. However, reduced size openings are permitted at the connection points of appliance vent connectors. Applies to building owners managing venting systems.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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504.3.9 Common vent fittings.

FGC § 504.3.9

At the point where tee or wye fittings connect to a common vent, the opening size of the fitting shall be equal to the size of the common vent. Such fittings shall not be prohibited from having reduced size openings at the point of connection of appliance vent connectors.

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