Air-Care 18-in W x 24-in L x 1-in Washable 8 MERV Electrostatic Air Filter in the Air Filters department at Lowes.com
Amazon.com: Trophy Air Washable Electrostatic HVAC Furnace Air Filter, Lasts a Lifetime, 6 Stage Permanent Air Filter, Healthier Home or Office, Made in The USA - Increases Airflow (16x25x1) : Sports & Outdoors