Some people call old-fashioned vacuum cleaners “dust generators”. One end sucks in unsightly debris and the other end emits fine dust.
Foreign families began to use vacuum cleaners with exhaust overspeeders ten years ago, and now a small number of domestic brands of vacuum cleaners are also equipped with exhaust overspeeders.
The efficiency specification of the filter in a vacuum cleaner is generally F7 (the average filtration efficiency for 0.4um is 80%-90%). This exhaust filter can block most of the inhalable particles.
There are also some exhaust filters made of PTFE air filter membrane.
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