I have had several air purifiers over the years and they required weekly cleaning of the blades- a very dirty job. I bought the SANS large and it cleans my 1700 s.f. home completely. I have had it 3 months now and I haven't had to dust! I have a cat and there is no dust residue from his litterbox. A friend who is highly allergic to cats and our seasonal Florida pollen, stayed here for 2 weeks and reported absolutely NO problems with her allergies. Your customer service is outstanding,!
The SANS is an investment, but well worth every dollar!