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Can return on a gas furnace be taken through a louvered door?

Question asked by hankc on May 8, 2019
Latest reply on May 10, 2019 by milt.werner

Section 10.3.7.4 of NFPA54 2015 states "Where a furnace is installed so supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace."

If a direct vent furnace is in a closet with a louvered door in an apartment, is the apartment considered outside the space containing the furnace or can return air be drawn through the louvered door?

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