Cost savings because only the filter is changed, not the entire hood.
节省成本，只需更换滤网，而非整个系统。
The hood contains a HEPA filter that removes more than 99.97 percent of submicron particles such as anthrax, smallpox, and radioactive particles.
这种救生罩带有一个HEPA过滤器，它能过滤超过99.97%的细微颗粒，如炭疽，天花和放射性粒子。
Air of kitchen and diesel generator room is exhausted by filter-type extraction hood, which is laid on the roof of the building.
厨房及柴油发电机房排风采用过滤型排气罩，且屋顶排放。
Air of kitchen and diesel generator room is exhausted by filter-type extraction hood, which is laid on the roof of the building.
厨房及柴油发电机房排风采用过滤型排气罩，且屋顶排放。
应用推荐