Series : W Material : Wood Stile Size : 0.75 In. x 3.5 In. Tread Size : 0.75 In. x 3.5 In. Load Capacity (Lb.) : 250 Minimum Ceiling Height : 7 Ft. 11 In. Maximum Ceiling Height : 10 Ft. 4 In. Rough Opening Length (In.) : 54 Rough Opening Width (In.) : 22.5