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NYC Mechanical Code

§ 506.3.7 — § 506.3.7

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What is NYC MC § 506.3.7?

Quick Answer

This section mandates the construction and installation of duct systems serving Type I hoods to prevent grease accumulation. It specifies required slopes for ducts and restrictions on the installation of dampers. Applies to building owners with commercial cooking operations requiring grease duct systems.

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

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506.3.7 Prevention of grease accumulation in grease ducts.

MC § 506.3.7

Duct systems serving a Type I hood shall be constructed and installed so that grease cannot collect in any portion thereof, and the system shall slope not less than one-fourth unit vertical in 12 units horizontal (2-percent slope) toward the hood or toward a grease reservoir designed and installed in accordance with Section 506.3.7.1. Where horizontal ducts exceed 75 feet (22 860 mm) in length, the slope shall be not less than one unit vertical in 12 units horizontal (8.3-percent slope). Dampers shall not be installed in the grease duct systems, except as required by Section 506.3.5, Exception 2.

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