This Louisville AL2540OLG-RS Aluminum framed attic ladder offers an R5 insulated door with weather stripping factory installed providing more energy efficiency than a traditional attic ladder, improved squareness and predrilled holes for ease of installation. Designed for attic opening od 22.5 In. x 63 In., fit ceiling heights from 10 Ft. to 12 Ft. Gas piston syustem allows easier and smooth opening and closing door. This attic ladder has working load capacity of 375 Lb.