Filtrete Select Healthy Living Filter, 18-Inch by 18-Inch by 1-Inch, 1-Pack 93% effective at capturing particles like dust mite debris, pollen and mold spores from the air passing through the filter Almost twice the small particle filtration than our Allergen Defense Filter Outperforms fiberglass, washable and non-electrostatic pleated 1" filters Lasts up to 3 months For residential use only