Filtrete Premium Healthy Living Filter, 20 x 20 x 1-Inches, 1-Pack This disposable filter electrostatically attracts and captures large and small air-borne particles before they contaminate the air in your home With each pass through the specially pleated filter, the air in your living space improves, making for a healthier home environment Outperforms fiberglass, washable and non-electrostatic pleated 1" filters Lasts up to 3 months For residential use only