I have purchased 2 of the larger Breathe Smart air purifiers and 2 Fit 50s. I even have one in my RV. I have tried other brands and they are not even close. All of the Air Purifiers remove unwanted pollen from the air as well as smells. My wife and I suffer from allergies and the Alen purifiers remove a tremendous amount of dust and pollen from the air. I clean the outer filters with a vacuum cleaner once a month and my allergies have significantly reduced. The newest Alen air cleaner offered by Alen can clean up to 1300 sg. feet and is quieter than any other on the market. I highly recommend Alen air products.