IQ AIR FILTERS 2 PER BOX, SIZE 16"X 25" X 2.75" PART# SL-H11 ART#202.21.50.01.  NEW FACTORY REPLACEMENT FILTERS(HEPA-LIKE) FOR IQ-AIR CLEAN ZONE SL SERIES AIR PURIFIERS. HAVING HIGH EFFICIENCY PERFORMANCE WITH ULTRA LOW NOICE DESIGN FOR LARGER INDOOR SPACES.  SPECIALLY DEVELOPED FOR CONTROLLING AIRBORNE PARTICULATE MATTER, MICROORGNISMS, FINE AND ULTRA FINE PARTICLE URBAN CITY SMOG POLLUTION BUT ALSO AS SILENTLY AS POSSIBLE.  TYPICAL APPLICATIONS OF THE CLEAN ZONE SL SERIES ARE MEDIUM SIZE PUBLIC, INSTITUTIONAL AND COMMERCIAL ENVIRONMENTS (EG SCHOOLS, HEALTHCARE FACILTIES, MUSEUMS, FITNESS CENTERS AND OPEN PLAN OFFICES.  PRICE IS FOR ONE BOX OF 2 FILTERS FACTORY NEW AND UNOPENED BOX. FOR CLEANZONE SL SERIES FILTER.