Fresh air filters on buses are just the beginning
Especially in school buses, children should be protected from viruses and bacteria.
Should we let our children on buses? How safe are they from COVID-19 infections in the busses? Parents as well as transportation and hygiene officials in the U.S. were also asking this question. They were after pragmatic solutions. One pioneer was the Prince George County School District in the US state of Virginia. As early as November 2020, the district equipped all buses for all of its 119 bus routes with air filters.
The choice fell on a filter solution from Webasto: "We were looking at filter solutions for other public transportation vehicles such as ambulances and fire trucks," says Dustin Nase, the district's transportation director. "That's how we came across Webasto and their air filtration system for ambulances." It could fit in buses, too, Nase thought, and in no time, mechanics were installing Webasto's fans in all the district's buses.
The advantage of Webasto's HFT 300 air filter system installed in the buses is that it can be operated independently from the bus's air conditioning system on a 12V power source. This simplifies and speeds up installation. In addition, it can be mounted vertically or horizontally in the interior of the school bus. "The unit moves a very high volume of air at a high pressure drop," explains Webasto’s Paul Baczewski, USA National Account Manager Bus Products.
"The pressure drop means that a large volume of air is coming into the filter, but only a minimal amount is coming out of the filter," Baczewski says. It is this combination of a high volume of air with a high pressure drop that is needed to remove, for example, COVID-19 particles in a single ventilation pass. "This is important because otherwise the contaminated air would circulate in the vehicles for too long,“ Baczewski explains.