18x20x1 Furnace Filters

Breathe cleaner air with our premium 18x20x1 furnace filters. Available in MERV 8, 11, and 13 ratings to capture dust, allergens, and pollutants. Our pleated design maximizes filtration surface area while maintaining proper airflow. Replace every 90 days for optimal HVAC performance and improved indoor air quality. Order a case of 6 today!