No need to open the window, 24 hours of fresh air
While the outdoor oxygen-containing air is drawn into the room, the indoor temperature is kept constant, creating a fresh indoor environment.
The unique silent mode, such as the calmness of the breeze, is almost impossible to feel it at work.
Black Forest. Fresh air purification products are widely used in homes, schools, banks, hotels,
shopping malls, hospitals, enterprises and other indoor places.