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That's a different argument -- whether or not the HEPA filter really is a HEPA filter.
by Johnny555 7y ago
That's a different argument -- whether or not the HEPA filter really is a HEPA filter.
- jlokier 7y agoAnd whether the seal around the HEPA filter that the HEPA filter is put inside is airtight. E.g. I've seen some vacuum cleaners which have HEPA filters reviewed as a bit useless at filtering because the particles flow through small gaps around the filter.