Bosch Thermotechnik GmbH Air 4000 - 3-in-1 filter White

Bosch air purifier effectively removes pollutants, pollen, and dander from rooms up to 62.5 m², with 3-in-1 filter, auto mode, and ultra-quiet operation under 25 dB(A). Review: Great air purifier - Neat design and well made, chosen for Bosch make, very quiet on night mode, and great for clearing the air, difference is noticeable. Very pleased. Review: Gets rid of floating dust - Why did we buy it - We moved to a very dusty, thatched property which started to cause problems for my wife - an asthma sufferer. Overall - Within a couple of days of switching on the purifier she stopped having to use her inhaler, so this clearly works. The mass of floating particles, visible under ceiling spotlights, was also decreased to just a few specks and dust accumulating on surfaces has fallen significantly. How it works - A fan blows directly upwards and draws in air through slits low down around the side of the unit. There is a large filter inside that removes suspended air particles. Size - On reflection I am not sure I needed to get the 6000 version which is about the size and shape of a 60l kitchen pedal bin. It's not something that you can conceal in a room. That said, because it is handling larger volumes of air than a small unit, it is not necessary to have the fan running at its maximum which means noise and stress on the motor are minimised. Noise - At full speed the fan creates a lot of air movement so it's understandably noisy but not as loud as a vacuum cleaner or hair dryer. It takes so little time to reduce the dust that it really only works at full power for very short bursts. On its lower settings it is very, very quiet and the lowest speed with the nighttime setting, you can only tell it is working by putting your hand over the top to feel the air movement. Weight - Despite its size the purifier is quite light. It doesn't have a carry handle though so moving it around is not as easy as it could be. Operation - It is easy to use. The controls are on the top and digital, touch-sensitive. The automatic setting reacts to the amount of dust or gases and the fan speeds up or slows down accordingly. You can override the automatic setting to control the fan speed. Air quality and humidity are displayed and LED lights indicate the air quality - from red, poor, through orange and purple to blue, excellent. There is also a nighttime setting which shuts off the lights and display. What would have been better - A remote control would have helped and a carry handle, otherwise nothing.