This Louisville Energy-Efficient Series aluminum attic ladder has a working load capability of 375 Lb. This energy-efficient ladder features an insulated door with R-10 extruded foam and weather stripping seal that reduces air leakage. This attic ladder fits ceiling heights of 7' 7" to 10' 3" and has a rough opening of 25.5 x 54". The Energy-efficient AEE2510 features slip resistant cross-tread steps, adjustable shoes, an advanced cylinder design, and an ergonomic T-handle.