The A 2000 is one of the most advanced portable air cleaners available on the market. It is tested and certified for use as both an air cleaner and a negative air machine. Thanks to a reliable filter system and a design that is perfectly matched to operation with HEPA class H13 filters, that are tested and certified at an efficiency rate of 99.99% at 0.3 microns, the air cleaner puts out superior air quality – be it when dealing with concrete dust, fine sanding dust or gypsum dust. It has two warning lights to indicate when the filters are clogged or leaking. Operates at two very quiet speeds. Due to the compact design, this unit is easy to move and transport. Non-marking, lockable wheels allows for easy transport.