Works in a hall of 17 sq. M, threshes at night, it is not audible from the bedroom. In combination with Venta LW15 Comfort, which is installed in a bedroom of 13 sq. M. - completely close the issue of humidity in the house during the heating period. Was: Humidity 30-40% at 25C Now: 40-55% at the same 25C I got air filtration as a bonus - the photo shows how much dust / dirt flies in the air and is collected through a water “natural” filter. The problem of water bogging and rottenness is solved with a special additive Venta, in the photo it is a blue bottle (+2200r for 500ml), 25ml is added every 14 days with a complete change of water. I recommend to buy, but with some reservations, which are described in this review.