The system also contains either ductwork, for forced air systems, or piping to distribute a heated fluid and radiators to transfer this heat to the air.
系统包括强制送风的风路系统或加热流体的管路系统，通过散热器传给空气。
Forced air systems send heated air through ductwork. During warm weather the same ductwork can be used for air conditioning. The forced air can also be filtered or put through air cleaners.
强制送风系统通过风管送热风，热天风管也可用于空调强制送风也可过滤或连接空气净化器。
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