4 ms·
At least some of them don't really work at all. https://www.youtube.com/watch?v=VM9CJZpqfpA https://www.youtube.com/watch?v=VM9CJZpqfpA With something as simpl
by bipson 7y ago
At least some of them don't really work at all. https://www.youtube.com/watch?v=VM9CJZpqfpA https://www.youtube.com/watch?v=VM9CJZpqfpA
With something as simple and effective as HEPA-filters, it seems unreasonable to try other technologies.