在危险化学品生产和销毁工厂的通风系统中一定要设置滤毒装置，介绍了滤毒过滤器的设计与阻力确定方法。
The filter must be set up in ventilation system of the production and disposal of dangerous chemicals and the design and resistance determination methods of filter with toxic gas are also introduced.
密封罩用组件。第4部分：通风和气体清洁系统(如，过滤器和疏水阀)的安全和规定。阀门、控制和保护装置。
Components for containment enclosures - Part 4: Ventilation and gas-cleaning systems such as filters, traps, safety and regulation valves, control and protection devices.
高架道路将配备噪声隔板，光线反射装置、通风设施及二氧化碳过滤器。
The elevated highways would be equipped with noise insulation, sunray reflectors, ventilation and CO2 filtering.
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