Air - heating systems circulate air through ducts to and from an air heating collector ( Figure 1 ).

空气加热系统使空气循环,通过通往或是通出空气加热收集器的管道 ( 见图一 ).

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Also covered are forced air heating, heat pumps, automatic control thermostats, flues and sound and vibration.

此外盖住是被被迫的空气加热, 热帮浦, 自动控制恒温器, 烟道和声音和振动.

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The necessary air heating device may be direct - fired or heated indirectly by steam coils.

必需的空气暖气装置可能是直接的-点燃或藉着蒸气卷间接地加热.

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