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NYC Mechanical Code

§ 510.9.1 — § 510.9.1

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What is NYC MC § 510.9.1?

Quick Answer

This section mandates that duct joints must be constructed with a minimum lap of 1 inch to ensure tightness. It also recognizes compliance with specific SMACNA/ANSI standards for duct construction. Applies to building owners involved in the installation or maintenance of duct systems.

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

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510.9.1 Duct joints.

MC § 510.9.1

Ducts shall be made tight with lap joints having a minimum lap of 1 inch (25.4 mm). Joints used in SMACNA/ANSI Round Industrial Duct Construction Standards and SMACNA/ANSI Rectangular Industrial Duct Construction Standards are also acceptable.

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