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A comment on A small DIY air purifier. Parent comment

Re:A small DIY air purifier by cosmolev on Tuesday January 21, 2020 @10:28AM (#22107733)
I have smartairfilter's Cannon purifier. As all those standalone purifiers it works only with windows completely closed.

I went for ventilation systems that take air from outside, filter it and then bring it inside the room. Namely Xiaomi MJXFJ-300-G1: https://www.xiaomitoday.com/xiaomi-mijia-air-purifier-mjxfj-... I've installed one in every bedroom.

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Re:A small DIY air purifier by driverdan on Tuesday January 21, 2020 @10:54AM (#22107993)
That seems quite expensive for what it is. For that price I'd expect it to have an efficient heat exchanger.
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