DESC: Airpura makes industrial grade air purifiers available to the general public featuring unobstructed air flow, powerful, variable speed integrated motors, pressure sealed filter chambers, and superior quality True HEPA filters. The I600 is designed for use in healthcare clinics and institutions with a large True HEPA filter and cleanable pre-filter. This powerful air filter is effective in spaces up to 2000 sq. ft. and cleans the air approximately every 30 minutes.