为了保证进入室内空气的洁净，进气口可以安装可更换的过滤芯。
To ensure access to clean indoor air, into the mouth can be installed to replace the gas-masks.
此结构可方便地安装在狭小的空间中且更换滤芯也方便。
The structure can be conveniently installed in a narrow and small space, and is convenient to exchange the filtrating core.
此结构可方便地安装在狭小的空间中且更换滤芯也方便。
The structure can be conveniently installed in a narrow and small space, and is convenient to exchange the filtrating core.
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