
When a boiler is located in an unconfined space in a building of conventional frame or masonry construction infiltration may provide adequate air for combustion and ventilation. If there is any doubt, install air supply provisions for combustion and ventilation in accordance with section 5.3, Air for Combustion and Ventilation, of the NFPA54 1988 code, it is recommend that you follow, the applicable provisions of the local building codes as well. When a boiler is installed in a confined space, i