I have smartairfilter's Cannon purifier. As all those standalone purifiers it works only with windows completely closed. I went for ventilation systems that ta

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-300-g1-intelligent-household-filter-at-1040/ https://www.xiaomitoday.com/xiaomi-mijia-air-purifier-mjxfj-... I've installed one in every bedroom.