The third sector, and of the smallest size, is connected to Primary fan outlet ducting and the other side is connected by ducting to take hot air for heating the air going to the pulverisers and to carry hot coal air mixture to boiler burners.
The third sector is connected to Primary fan outlet ducting. The third sector is and of the smallest size. The other side is connected by ducting to take hot air for heating the air and to carry hot coal air mixture to boiler burners. This air is going to the pulverisers.