So that their children can go back to school soon, fathers have installed a ventilation system in a classroom in Unterschleißheim.
Unterschleißheim - In classroom 103 in the Carl-Orff-Gymnasium in Unterschleißheim, wide aluminum tubes hang from the ceiling above the student tables.
It is a ventilation system that was installed on the initiative of the parents' council and enables effective ventilation without freezing in Corona times.
The idea came from researchers at the Max Planck Institute for Chemistry in Mainz
The construction is not exactly elegant, but extremely simple, effective and cheap.
It was implemented with materials worth 1000 euros and is based on studies by the Max Planck Institute for Chemistry in Mainz.
Fathers look for technical solutions on their own initiative
The fathers Roderich Busch and Harald Winter, whose children are attending high school, were driven by the urgent desire that the students should soon be able to return to face-to-face classes.
They have dealt intensively with technical solutions on their own initiative, made a lot of phone calls and made contact with the Mainz company Aerovec.
Fans continuously suck in warm, rising air from the ceiling.
The used air is transported outside through the double-walled tube, which has small openings.
At the same time, fresh air flows from outside through the inner pipe into the classroom.
The system also saves heating energy through heat recovery.
Low-budget solution initially raised doubts
"It could be a way out of the ventilation dilemma in Corona times," says Second Mayor Tino Schlagintweit, who advocated the experiment at the request of the parents' council.
Because the low-budget solution initially aroused doubts in the city administration and in the school association.
The system was installed within a day
The parents' council was ready to finance the system.
Its members Roderich Busch and Harald Winter did some persuasive work in the town hall.
The city insisted that technically qualified craftsmen take over the assembly and agreed on January 26th.
Roderich Busch: "Everything can be dismantled."
Two days later three fitters from the Aerovac company arrived.
Together with their fathers and two exhibition builders from Unterschleißheim, they installed the construction in one day.
“The students came two days later,” reports Busch. The system was initially too loud for them.
Busch and Winter have now insulated the fans.
"Everything can be dismantled, nothing is broken," says Roderich Busch (64), a pilot by profession.
He sees a clear advantage over air filters customary in the industry, which are located in the classroom and suck air horizontally through the room: "In this system, aerosols are disposed of upwards, they do not pull past the students."
Emergency calls for special resources
He is currently measuring efficiency, for which he has borrowed equipment from Professor Bernhard Kurz from the Technical University of Munich, who is studying the effectiveness of air particle filters at a primary school in Oberschleißheim with students.
Another classroom without a filter serves as a comparison room.
“The measurements are very promising,” says Busch.
The school administration association will now decide whether the kit will be installed in other rooms.
"In normal times you would never hang such tubes into the room," said Bush, "but we have an emergency, because you have to do everything one can think and what helps."
Icb