Filterbuy 21x23.5x5 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement for Trane Perfect Fit & American Standard (Actual Size: 20.00 x 23.09 x 4.97 Inches)21x23. 5x5 replacement whole house air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 20. 00" x 23. 09" x 4. 97") MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from mold, pollen, and more while trapping 90% of dust particles without impacting air flow High quality construction (made in the USA) features an electrostatically charged design with 8 pleats per foot that captures more harmful