The existing auxiliary wind adjustment has a nonideal quick opening characteristic and intense vortex.This paper offered a new design of the controlling valve. 對鍋爐配風二次風調節器件進行研究，現有的二次風調節風門具有極不理想的快開特性，另外風門渦流強烈。
They are of the hygroscopic type, able to recover winter moisture from the exhaust air and thus reduce the load on the supply air humidifiers. 它們是吸濕型的，能夠減緩冬季排氣所帶來的濕氣，因此降低對輔助空氣吸濕器的負擔。
A human body needs a continuous supply of air. 人需要連續不斷地補充空氣。
