the secret to oreck's effectiveness is its patented truman cell filter. only oreck has it.ier constantly moves the air in the room through its powerful six-stage filtration system. its electrostatic plates capture many impurities such as dust, allergens, bacteria - even viruses -- then puts clean air back in the room. with hepa filters, you could easily spend hundreds of dollars on replacement filters in just five years. but the permanent oreck truman cell is guaranteed for life and should never need replacing. just rinse and reuse! how clean is the air in your home? try my oreck professional air purifier in your choice of black or silver for a full 30 days risk free, with free shipping! if you don't breathe easier, sleep better, wake up more refreshed, dust your home less and simply enjoy the benefits of fresh, crisp, clean air, just send it back. it won't cost you a dime to try it. i'll ship it to your home at no charge, and you decide to return it, i'll even pay to take it back. you've got nothing to lose. you'll also receive my amazing refrigerator purifier! it destroys