Collection: 18x18x1 Furnace Filters

Breathe easier with premium 18x18x1 furnace filters. Our selection includes MERV 8, 11, and 13 ratings to capture everything from dust to allergens. These high-quality filters improve air quality while protecting your HVAC system from harmful particles. Perfect for both standard and geothermal systems, our filters deliver exceptional performance for cleaner home air.