The Filterbuy 20x25x4 Air Filter MERV 13 Optimal Defense is a high-quality furnace filter designed to improve indoor air quality and enhance the efficiency of your heating and cooling system. Made by FilterBuy, this pleated HVAC filter is designed to trap airborne particles and contaminants, providing optimal defense against allergens and pollutants.
I have a box of 20x25x4 Filterbuy Indoor Air Filters
You can either buy one individually or multiple
It is optimal and suitable for both residential and commercial use. They are Merv 13.