Because of the problems with SCBA systems, any respirator that you are likely to use will have a filter that purifies the air you breathe.
由于SCBA系统存在的不足，任何您可能用到的呼吸器都会有一个过滤器来净化呼吸所需空气。
In the 1980s, the first air intake systems were offered and consisted of molded plastic intake tubes and a cone-shaped cotton gauze air filter.
在1980年代，进气系统第一次提出了模塑料进气组成，一个锥形棉质纱布管和空气过滤器。
Nylon prefilters are widely used in fan filter units, indoor filtration systems, and systems with high air volume.
良好的除尘性，可以广泛用于风机单元，扩散的室内设备及大风量的通风系统中。
Nylon prefilters are widely used in fan filter units, indoor filtration systems, and systems with high air volume.
良好的除尘性，可以广泛用于风机单元，扩散的室内设备及大风量的通风系统中。
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