The A 1000 is one of the most advanced portable air cleaners on the market. Tested and certified to be used as both a stand-alone air purifier and for evacuation. Thanks to a reliable filter system and a design perfectly suited for use with HEPA class H13 filters, tested and certified with a separation efficiency of 99.99% at 0.3 microns, this air purifier delivers superior air quality, whether it's dealing with concrete dust, fine grinding dust or drywall dust. It has two warning lights to indicate if the filters are clogged or leaking. The A 1000 is a low-noise air cleaner with a powerful and compact design. The motor can be set to two different speeds. The airflow is directed upwards to avoid spreading dust on floor surfaces.