In addition, indoor air system, heat recovery systems, central vacuum system, fire doors Solenoid Valve Control system and indoor fire hose system configurations are rare in China.

此外，室内空气系统，热回收系统，中央真空系统，防火门电磁阀控制系统和室内消防水带的系统配置在中国是罕见的。

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Vacuum solenoid valve, is used for vacuum piping system, or vacuum equipment, electromagnetic valve is used to control the vacuum.

是指用于真空负压管道系统，或者真空设备上，用来控制真空的开关的电磁阀。

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