Beurer Large Room Air Purifier LR310-66019 4 "Room Air Purifier" Mr Clark 31 March 2020 Looks to work really well. Have just cleaned the filter and the amount of dust on there for the time it has run is unbeliveable. I suffer with astma and feel better when the unit is running. Down side> Although the filter is cleanable at some point it will need replacing and this is not listed on this site