Sünte Marien School, Wietmarschen

Comfortable ventilation has been on the timetable at the Sünte Marien School in Wietmarschen since December 2021. The reason for this: 17 new Kampmann "WZA" decentralised school ventilation units have been installed in the classrooms.

The municipality and the school governors invested in the upgrading of the school with the help of financial support from the BAFA for the "new installation of stationary air handling units".

Permanently clean and good indoor air is the prerequisite for optimum learning success. Now almost 200 pupils in 10 classes and 15 teachers are benefiting from the demand-led supply of fresh outside air. It has been shown that poor ventilation and therefore an excessively high percentage of CO2 in rooms causes headaches and fatigue, as well as disruption to concentration. The WZA also reduces pollen, dust and virus loads. Moisture recovery is used to enrich the outside air supplied with moisture from the extract air. Good indoor humidity is crucial for the body's own viral defence, as it prevents a person's mucous membranes from drying out.

The units feature a weather protection hood on the façade, which protects them against driving rain and prevents the creation of a short circuit between the outside air intake and the exhaust air outlet. Kampmann was committed to sustainability in the development of the school ventilation unit. Due to the built-in heat recovery unit in the unit, considerably less energy is lost than with irregular ventilation through the windows. Continuous ventilation does not abruptly cool down the temperature in the room, rather keeps it constantly at a level. There is no longer a need for shock ventilation, as was the case during the coronavirus pandemic. In automatic mode, the CO2 content in the room is permanently measured and the ventilation is adjusted accordingly. A total of between 400 and 1000 m³/h of clean outside air is supplied into each classroom. In nominal air operation, the unit delivers 800 m³/h at very quiet operating noise levels with a sound pressure level of only about 35 dB(A). There is also a pleasant mixed air situation due to the flow of the outside air outside the direct occupied zone, namely along the ceiling of the room. The unit is operated by a 'Solo' button. And the space required for the unit can be used creatively and individually, as the large white surfaces are magnetic. WZA units can be installed while the school is occupied. Once the two cubes and the casing have been installed, the local decentralised ventilation unit can be plugged in and put into service.

The issue of "optimum ventilation of school classrooms" took on a key role during the coronavirus pandemic and has become very present. Adapted ventilation can create an optimum learning environment and generate constant indoor air comfort in the classrooms.