Filtrete 20-in W x 25-in L x 1-in MERV 14 2500 Smart Premium Allergen and Ultrafine Particle Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com
20x25x1 Pleated Air Filter MERV 8 12-Pack | DiscountFilters.com
PureAir® 20" x 25" x 1" MERV 11 Premium Allergen Air Filter - 6 Pack White-HVAC2025116 | Frigidaire
Filtrete 20x25x1 Air Filter, MPR 2800, MERV 14, Healthy Living Ultrafine Particle Reduction 3-Month Pleated 1-Inch Air Filters, 2 Filters - Amazon.com