With our portable air scrubbers you can truly have sub-micron filtration anywhere without touching your HVAC system. One portable HEPA air scrubber air filtration unit can successfully filter a 3,000 square foot area. By placing the flat cut pad – our 8” Circles – you are able to have to-go air filtration, that adds to your air changes and provides additional ventilation. MERV 17+ Rating. Removes 99.95% of all particles down to 0.1 micron in size.