Electric telescopic ladder

The ladder should not be mounted on a vertical wall, it should be mounted on the ceiling. The actual dimensions of the ladder are 27''W X 38.7''L X 5.1''H inches, the S-hinged section is made of high strength carbon steel and the treads are aluminium with a non-slip design, with a maximum load of 500 lbs. Ceiling opening for ladder installation: 70 cmx (100-120 cm) / 27.6 x (39-47"), if the actual length of the square opening for the ladder is too long than 39''D, the excess gap can be bridged by adding wooden panels. Thickness of the ceiling 13-20cm/5.1-7.9 inches. The distance between the opening and the wall should be greater than 5cm/2in. Please check these dimensions before ordering. The ladder with 11 treads (number of treads adjustable) approximately 11ft/3.3 M long when fully open and has a maximum vertical height of 9.8ft (3 m) When open, the feet are approximately 4.6ft/1.38 M from the wall and the angle is approximately 60°. Steps can be removed for treads heights below 9.8 feet / 3 m The attic staircase is equipped with a special manual drawbar, which allows the ladder to be operated by wireless remote control under normal conditions, and also allows the attic staircase to be lowered and retracted manually by means of the drawbar in special cases.The corners of the frame were bent and damaged due to collisions during transportation. However, it can be used safely after repair.