Dimensions (WxTxH) approx. 1185 x 710 x 1204 mm, weight of approx. 200 kg, power supply with protective contact plug (230v, 50Hz), power output of ca. 170/250 watts at standard operation, sound pressure level <40 dB (A) at standard mode and 40 – 50 dB ( A) at maximum operation, air flow rate at standard operating mode: 500m3/h – 1500m3/hr and at maximum operating time: 1500m3/h – 2400m3/hour, sensor technology: CO2, humidity, temperature, Differential pressure, Bluetooth, attendance recognition, year of construction: from 2021   The room air purifiers have an integrated CO2 traffic light with ventilation recommendation (recognizable by a colour-changing display) as well as a function monitoring with maintenance notice. Automatic disinfection via UV-C irradiation (ozone-free) takes place during use. A presence detection with automatic activation + follow-up is also integrated. Furthermore, the devices have several connectivitys such as WIFI, web servers, Bluetooth and home servers. An air change of 5 - 10 times the volume of space per hour (but at least 4 times) is recommended. With a room size of 2.5m, for example, one would be at 120m2/240m2 with a 5-fold air change per hour. The devices are functional and have no apparent damage. A CE mark is available. The last maintenance of the equipment took place in January – February 2023. The commissioning was in September – November 2021.   It is recommended to visit the equipment before making bids. The auction item can be checked outside the school holidays Monday to Friday from 08:00 – 3:30 pm after consultation and prior registration. When picking up the air purifiers, separate loading shall be carried out. The air purifiers are located in the basement, an elevator is not available.   You will be sent a purpose (cash sign) by mail. Please transfer the amount only after receipt of the intended use. The devices can only be picked up when the amount is already paid.