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Air inlet vents controlled by humidity sensors are controlled automatically. The stream of air is dependent upon the water steam content (relative humidity level) inside the room, that is on the air pollution arising from activities undertaken, such as laundry, cooking, drying, etc.
The control element is a polyamide tape which affected by relative humidity fluctuations in the air changes its length, which in turn causes the choke valve to open, and thus supply air to the room.
If the humidity in the room is lower or equal 5%, the air inlet vent is throttled back, and with increase of humidity, the air inlet vent opens. When 70% or more is reached, the maximum capacity is achieved. It is possible to lock the position of the minimum inflow of air.