AL 8-24-04123-1 Panel Air Filter for Nilfisk-Advance, Nilfisk-American Lincoln Sweepers. Standard cellulose filter media enclosed in a sturdy galvanized frame with a heavy duty poron or urethane gasket material. Fits Nilfisk and Clarke American Lincoln models including 3366, 3366XP, 4366, 4366XP, and Granterra Models. Will not fit 3366/4366 models with the Pulse Air option (use AL 8-24-04146 / 8-24-04155). Measures 23-1/2 x 23-1/2 x 3-5/8". Most models require two filters. Please check your model before ordering. We also offer this filter in a synthetic water-washable poly media, our AL 8-24-04123-2. Priced Each. Replaces Nilfisk-American Lincoln 8-24-04123-1, 8-24-04134-1. Our Part Number AL 8-24-04123-1P