AIRx Filters 18x20x1 Air Beast (Actual:17.50 x 19.50 x 0.75in) air filters are meticulously designed to remove lint, dust, pollen, dust mite debris, mold spores, pet dander, smoke, and smog and tested according to the ASHRAE 52.2 standard. Using a MERV MERV 11 HVAC filter media reduces potential allergens, pets odors, smoke, etc. that can greatly affect the quality of your indoor air. Besides cleaner air, AIRx Filters Air Beast 18x20x1 replacement air filters are constructed to use 65% more pleats per square inch resulting in superior airflow compared to other standard air filter replacement, leading to optimal HVAC heating and cooling system performance and reduced energy and maintenance costs. The AIRx Filters Air Beast 18x20x1 replacement air filters are compatible replacement intended for popular residential HVAC furnace systems including: Carrier, Bryant, American Standard, Trane, Amana, HEIL, Daikin, York, Lennox, Goodman, Rheem, Ruud, LG, and others. Every AIRx Filters HVAC air filter replacement is proudly made in the USA with high-quality materials, ensuring a great air filter at a great price every time. Compare these air filters with Allergen Defense, Clean Living, Healthy Living, Odor Reduction models. Buy with confidence and expect these replacement air filters to last 90 days in most homes or for increased energy efficiency, replace filters every 2 months. DISCLAIMER: DiscountFilters and AirX Filters are not affiliated with the brands in this listing. This is not an OEM product and is not covered under any brand/manufacturer's warranty. Any use/mention of the brand name or model designation for this listing is made solely for purposes of demonstrating compatibility.