Aluminum fire escape extension ladder

Comply with GA*******7 "fire ladder" standards. 
High-strength high-quality aluminum alloy, pull the ladder in the process of expansion and condensation, which limit device safe and reliable. Can be used for fire fighting, rescue when climbing rescue, fire-fighting operations; especially in the city without climbing cars, and fire narrow passageways, rising car can not reach the scene, while the average height of the ladder at the scene and was less than required, the ladder can be used with fire fighting relief; may also be used in factories, mines, and other multi-storey buildings and various climbing climb maintenance operations. 
1. Working conditions (m): High 9 ± 0.2 (9.**7), the minimum width of the ladder (mm) **0 ± 3 (**0), ladders board spacing **0 ± 2 (**0); 
(2) the level of residual bending deformation ratio: ≤ 0.*0; (0.*5) 
3 rungs bending residual deformation ratio: ≤ 0.5; (0.*0) 
4. Weight: ≤ *3 kg; (*2.0)

Another similar model:TEL6
Please see following parameters:
1. Working conditions (m): High 6 ± 0.2 (6.*5), ladder width (mm) **0 ± 3 (**1), ladders board spacing (mm) **0 ± 2 (**0); 
2. Weight: ≤ *5 (*0.6) kg; 
3 levels of residual bending deformation ratio: ≤ 0.*0 (0.*5); 
4 rungs bending residual deformation ratio: ≤ 0.5 (0.*0);