More About Austin Air:Austin Air air purifiers are extremely popular with both our staff and customers. They offer no nonsense, no frills approach to air purification but they put their money into what really counts. Very good gas and odor filtration and the air filtration effectiveness is above average. We still do not like that Austin Air combined their gas and HEPA filters as these filters degrade at a different pace than each other. Like AllerAir and Airpura their filters are more difficult to change requiring a screwdriver and turning the entire machine upside down. But none the less, for our customers with serious allergy problems they are high up on our air purifier manufacturer list.