Gas Engineering Guide

Venting – Direct Venting Appliances with Sealed Combustion Chambers

Listed appliances having sealed combustion chamber, and which are so constructed and installed, that all air for combustion is derived from outside the space being heated and all flue gases are discharged to the outside atmosphere, shall be installed in accordance with their listings and the manufacturer’s instructions. (NFPA 54, 12.3.5).

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