Bosch 1900 DH W100 Quiet Bathroom Fan with Humidity SensorQuiet operation: the Bosch bathroom fan 1900 DH W100 operates with a noise level of only 28 dB(A). Perfect for reducing moisture, unpleasant odours and mould. For more comfort in your bathroom Humidity sensor: easy and convenient to use, thanks to automatic activation when the set humidity level is exceeded (40% 90%) and 3 30 minutes lag time with adjustable switch off delay Simply efficient: the exhaust air is transported to the outside, while the