Filtrete MPR 1550 20 x 25 x 4 (4-3/8 Actual Depth) Healthy Living Ultra Allergen Deep Pleat HVAC Air Filter, 4-Pack Actual Filter Size: 19 15/16 x 24 5/8 x 4 3/8. For residential use only. Outperforms fiberglass, washable and non-electrostatic 3-month pleated 1 inch filters Keeping your home clean and healthy is your mission and Filtrete Healthy Living filters can be your perfect partner. Featuring high performing electrostatic technology, Filtrete Healthy Living filters proactively capture dust, bacteria, germs, viruses and allergens in your air. For optimum performance, change your filter every 6 to 12 months. Filtrete 4" and 5 " filters help maintain airflow in heating and cooling systems, which helps prevent stress on the system and reduces the amount of energy needed to reach desired indoor air temperatures. Replaces Honeywell, Aprilaire, SpaceGard(R), and Day and Night brand filters. Can replace 20 x 25 x 4 inch filters with the same actual size. It is recommended you measure your current filter or filter slot to determine exact actual size needed for your system. Designed with Filtrete Brand 3-in-1 technology from 3M to pull in and trap unwanted air particles while letting clean air flow through Microparticle Performance Rating 1550