Experience cleaner, healthier air with the Filtrete Ultra Allergen (2 Pack) 20x25x1 . Specifically designed as an anti-asthma filter, it captures airborne particles that can trigger asthma and allergies, such as pollen, dust, and pet dander. Enjoy high efficiency and superior performance with this ultra allergen filter, perfect for improving indoor air quality and ensuring a healthier home environment. Make the switch to Filtrete and breathe easier with every inhale.