Ultra Allergen Pleated Air Filter, 3 Months, Purple, 17.5x23.5x1-in.

17.5" x 23.5" x 1", purple, ultra allergen filtrete pleated filter, 3 month filter is 90% effective at capturing large allergens like mold spores & pet dander, electrostatically charged, captures microscopic allergens like dust, smoke & smog, captures bacteria & particles that can carry viruses, meets the guidelines of the american lung association health house program, mpr rating 1500, lasts up to 3 months.