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A vent listed and labeled for use with wall furnaces.
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Related Code Sections

10.1.3 Vents,
Type BW vents shall be used only with listed vented gas wall furnaces having a capacity not greater than that of the listed Type BW gas vent ...
5.2.3 Selection of Chimney and Vent Types, Vents
hoods and other Category I gas appliances listed for use with Type B vents, such as: Vented wall furnaces listed for use with Type BW vents only ...
10.6.1 Vents,
Type B, Type BW, and Type L vents shall be listed and installed in full compliance with the terms of their listing and the manufacturers ...