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NYC Mechanical Code

§ 313.3.4 — § 313.3.4

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What is NYC MC § 313.3.4?

Quick Answer

This section mandates that fan equipment with motors exceeding 1/2 horsepower must be mounted on vibration isolators when located on roofs or elevated floors. It specifies the requirements for support and isolation efficiency. Applies to building owners with fan equipment installations.

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

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313.3.4 Fans.

MC § 313.3.4

All fan equipment with motors in excess of 1/2 horsepower (0.37 kW), located on any roof or floor other than a floor on grade shall be mounted on or from vibration isolators. Fan equipment with motor drives separated from the fan equipment shall be supported on an isolated integral rigid structural base supporting both the fan and motor. Fan equipment with motor drives supported from the fan equipment shall be mounted directly on vibration isolators. Each isolator shall have provision for leveling. Isolators shall incorporate resilient pads having a minimum thickness of 1/4 inch (6.4 mm). The vibration isolators shall provide a minimum isolation efficiency of 90 percent at fan rotor rpm with a maximum deflection of 2 inches (50.8 mm). Fans and compressors assembled in unitary containers may meet this requirement with isolators internal to the container providing the isolators meet the above minimum isolator efficiencies.

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