RoherJoggo324 years ago000Do any allergy sufferers here have experience with this air filter? Good or bad? And what confuses me is, why is the performance of an air filter displayed in M² and not M³?Show in original language (German)dlxfoo4 years ago • purchased this product000purchased this productUnfortunately, it didn't help me at all. I have a pollen allergy. That's why I returned the device.Show in original language (German)Comment2 comments