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