Actual Size (19.750 x 24.750 x 0.75). Dust and sand. Pollen (inanimate). Pet dander. Mold spore. Lasts up to 3 months. Enhanced with DuPont science. Improving indoor air quality while optimizing HVAC performance. Purafilter Pollen & Allergen performance filters are designed to last up to 90 days. However, local air quality surrounding your home and the environment within your home can significantly alter the useful life of your filter. Pets, painting, construction projects, etc. within the home reduce filter life. We recommend checking your filter every 30 days during moderate to heavy use of your HVAC system. Replace filters before they become completely covered with dust. This will prevent harmful back pressure on your HVAC system. Changing filters more frequently can also help to reduce energy costs. Free filter reminder service. We will be happy to provide you with a time to replace your filter reminder via email for free. Just log onto www.airfiltration.dupont.com and click on the reminder service to sign up. Limited Warranty: This product will be free from defects in material and manufacture for a period of 6 months from date of purchase. If this product is defective your remedy shall be replacement of the product or refund of the purchase price at Purafilter 2000 option. For warranty service, contact Purafilter 2000 at the address listed on this package. Limitation of Liability: Purafilter 2000 will not be liable for any loss or damage arising from the use of this product whether direct, indirect, special, incidental or consequential. In case of emergency, damage, or need of repair, please contact us at 828-324-6454 or you can contact us on the web at www.airfiltration.dupont.com or www.protectplus.com. Proudly made in the USA. Made in USA.