The 12 in. x 20 in. x 1 in. Filtrete Ultra Allergen Filter is a high-quality air filter designed to improve the air quality in your home or office. With its advanced filtration technology, this filter is capable of capturing up to 97% of airborne particles, including dust, pollen, pet dander, mold spores, and bacteria. It is ideal for individuals who suffer from allergies or asthma, as it helps to reduce the presence of allergens in the air. The Filtrete Ultra Allergen Filter is easy to install and fits most standard HVAC systems. It is recommended to replace the filter every three months for optimal performance. Invest in this reliable and efficient air filter to create a healthier and cleaner environment for you and your loved ones.