OES1583 Features: * Air Filter * 95pct Filtration media and 5pct cardboard * Best performing allergen reduction air filter * Maximum allergen/laboratory grade * Extended surface area for high capacity filtration * Electrostatic filter material * Lasts up to 90 days * Microban protection fights odor causing microbes on the air filter * Made in USA * Contains o-guard odor reduction technology * Ultimate performance in airborne allergen reduction