Saf-Escape - 3 Story 25 foot Portable Fire Escape Ladder 10" Thick Wall - Tangle Free Steel Chain - model # 1025 3 Story Portable Steel Chain Fire Escape Ladder - 25 ft Chain tension tested to 1000 pounds in weight, window width minimum 13" Suitable for most standard windows - wall thickness up to 10" deep Stand offs incl to keep ladder away from building-Adjust stand off placement to avoid windows below Ladders can be used more than once allowing for fire drills