The convector pits are covered with convrete grids that are prefabricated for building pigsties.

供器并被通常用在猪圈上的混凝土格栅覆盖。

When the temperature of the room reaches 20' C, the convector heater cuts out.

室内度达到摄氏二十度时，空气对流加器就会自动作。