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I read the sentence as "their two specific Blueair recommendations don't have HEPA-rated filters".


That's what seemed to be the most likely intended meaning, but the comma throws it off.


No it doesn’t. The comment’s syntax is correct. Commas before “which,” and not before “that.” https://www.dictionary.com/e/that-vs-which/#

The actual problem is the usage of “which.” If they’re Blueair purifiers that happen to not have HEPA filters, they should have made the clause essential/restrictive. If all Blueair filters lack a HEPA filter, then adding that they don’t have HEPA filters as clarification is non-essential.

So I understand your confusion, it’s just not for the reason you said it was.




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