Aerostar 20x20x4 MERV 8 Air Filter 2 Pack, HVAC Pleated A/C Furnace Filters, Electrostatic MPR 600 & FPR 5, Made in USA

Nominal size: 20x20x4; Actual size: 19 1/2" x 19 1/2" x 3 3/4"; This MERV 8 filter is comparable with MPR 600 & FPR 5. | Designed to filter microscopic particles to promote clean and fresh indoor air quality | Simple to install and a cost-effective step towards a healthier home environment. Replace 3"-5" filters every 3-6 months. | 100% synthetic electrostatic media for high efficiency with low air flow resistance | Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more productive