Non-Pleated Air Filter, Performance Rating MERV 5, Nominal Filter Size 20x20x1, 20 %, Fiberglass/ OVERALL WIDTH: 20.000 INCHES NOMINAL FACE VELOCITY: 300.0 FEET PER MINUTE BODY THICKNESS: 1.000 INCHES NOMINAL DESIGN TYPE: NONREUSABLE BODY OVERALL LENGTH: 20.000 INCHES NOMINAL FILTERING MEDIA DESIGN: ANY ACCEPTABLE SINGLE FILTERING MEDIA RESPONSE SPECIAL FEATURES: UL 900/CLASS 2 STYLE DESIGNATOR: A1 RECTANGULAR