The Aprilaire 416 Allergy & Asthma Filter traps up to 99% of airborne allergy and asthma triggers as they pass through the MERV 16 filter including dust, pollen, mold spores, bacteria, pet dander, dust mites, viruses, and the airborne particulates associated with tobacco smoke and smog. Superior home + system protection up to 6-month filter life.  For help with allergy and asthma triggers during allergy season and beyond, trust the Aprilaire 416 Allergy & Asthma Replacement Filter.  Note: MERV is a scale used to measure the effectiveness of air filters.  Higher number values translate to more effective filtration.  Choose the Aprilaire Filter with the MERV rating that fits the needs of your family and home.