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What is NYC MC § 911.4?

Quick Answer

This section outlines the requirements for the installation of duct furnaces, specifying that return air must be conveyed through sealed ducts terminating outside the furnace space. The installation must occur on the positive pressure side of the circulating air blower. Applies to building owners installing duct furnaces.

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

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911.4 Circulating air.

MC § 911.4

Where a duct furnace is installed so that supply ducts convey air to areas outside the space containing the furnace, the return air shall also be conveyed by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. The duct furnace shall be installed on the positive pressure side of the circulating air blower.

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