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NYC Mechanical Code

§ 508.1.1 — § 508.1.1

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What is NYC MC § 508.1.1?

Quick Answer

This section regulates the allowable temperature differential between makeup air and conditioned space air, limiting it to 10ºF unless the makeup air aids in heating or cooling, in which case a differential of up to 25°F is permitted. Applies to building owners managing HVAC systems.

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

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508.1.1 Makeup air temperature.

MC § 508.1.1

The temperature differential between makeup air delivered to the space and the air in the conditioned space shall not exceed 10ºF (6ºC) except where the makeup air contributes to satisfying the heating or cooling loads of the space and such temperature differential does not exceed 25°F (-38.9°C). The makeup air delivered to a compensating hood with front facing or side facing discharges shall be considered as being delivered to the space for the purposes of this section.

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