The Holmes HEPA Type Air Purifier with Life Long Permanent Filter removes up to 99% of airborne dust and pollen as small as 2 microns to help reduce smoke, mold spores and pet dander. The optional ionzer also ensures that smaller particles are bound together The permanent filter can be vacuumed, minimizing the need to buy replacement filters. The space saving tower design easily fits in any corner of the room leaving clean and crisp air all around your home.