Lennox 30023 Hammock Filter Material 24" x 20 Foot Roll (LB-71455) Cut To Fit Ameriglas hammock filter material lennox roll filters, For air conditioning and central heating systems with hammock filter frames FEATURES: Cut to size. Easy to install. Lasts up to 60 days. Coated with a film of viscosine adhesive. SPECIFICATIONS: Nominal Dimensions: 24"x 20`x 1"