Did Saab Invent the Cabin Air Filter? Probably not, but the Swedish cult brand was one of the first manufacturers to introduce it. That was in 1978, and Saab advertised one Particle-tight air filter for the interior. The passenger compartment of the Saab 900 was something special, once again greetings from aircraft construction.
Because inside the earthbound Saab there was a constant moderate overpressure. The fan blower always ran at the minimum level, the air pressure in the cabin differed slightly from the outside conditions. To keep pollen and particles out, the air first had to go through a filter that kept out particles larger than 0,005mm.
Research carried out by Saab in conjunction with Linköping University proved that 100% of all pollen was kept out. That was in 1978, when allergies weren't as high on the list as they are today.
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