Nominal Size: 20x25x4; Actual Size: 19 1/2" x 24 1/2" x 3 3/4" | Comparable to MPR 1000 to 1200 Micro Allergen Defense and Honeywell Allergen Plus FPR 7 | Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke. | Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but increase frequency to 30 days during peak summer and winter months | 100% synthetic electrostatic media for high efficiency with low air flow resistance

&q;:&q;Aerostar 20 x 25 x 4 Commercial HVAC Filter - Merv 11, Box of 2 Pleated MERV 11 Media Comparable to Filtrete MPR 1000 to 1200 Comparable FPR 7 Designed for Superior Filtration Efficiency Made with electrostatically charged synthetic material that captures 90% of large airborne allergens such as pollen, spores, and dust mite debris. It?s robust frame construction enhances quality and ensures high durability Improve Indoor Air Quality Protect your family and loved ones with clean indoor air quality at home. Aerostar filters are a simple and cost effective step towards a healthier home environment, free of airborne allergens and particles that can trigger allergy and asthma symptoms. Reduce Cost An Aerostar furnace air filter helps keep your HVAC unit working efficiently by removing dirt and reducing strain on the motor. When your unit runs properly, it consumes less energy, requires less maintenance and will have a longer life. These factors will have an impact on your utility bill and maintenance costs. It is recommended that you change the filter every 12 months during normal conditions but increase frequency during peak seasons when your unit is working the hardest. About Aerostar Air Filters Aerostar filters are manufactured in the USA by Filtration Group, a world-leading manufacturer and supplier of filtration solutions for residential, commercial and industrial applications. The Aerostar brand is known for constantly innovating and improving their technology to help make filtration more efficient, effective and environmentally friendly every day. What&s;s in the Box Box of 2 Aerostar Commercial HVAC FiltersNominal Size: 20 x 25 x 4 Actual Size: 19 1/2\&q; x 24 1/2\&q; x 3 3/4\&q; , Size: 20x25x4, AC and Furnace Air FiltersPROP 65 WARNING: This product can expose you to some kind of chemical, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.&q;,&q;