Brought in July but only used in December, had to be removed after 1-2 weeks and surprised at the short return policy (only 1/2 cost was reconfigured since it was used). I also found out about the Merv ratings, it's a Merv 8 and I found that the filtrate removal filter I brought to replace has a Merv rating of 12. I'm severely allergic to dust and mold and I usually just see what the brands say about filters, another permanent filter I brought from Revain, I take out and wash closer to the advertised 90 day usage time, and during the Drying I use a disposable filtrate filter that I have to change about a week after 90 days.
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