1. Size: The length is produced according to the design size, and the width is 1140mm; the height of the ladder step is ≤250mm; the net depth of the step is ≥25mm. 

2. Base plate: 18mm flame retardant plywood + 20mm pearl cotton + 20mm flame retardant sponge + 0.8mm flame retardant PU leather; 

3. Steps: 18mm flame-retardant plywood + 20mm pearl cotton + 20mm flame-retardant sponge + 0.8mm flame-retardant PU leather;

4. Both sides of the stairs: 18mm flame retardant plywood + 10mm pearl cotton.

5. The bottom foreskin has no less than 4 ear-shaped fasteners in a single compartment Install

6. Inclination angle: less than 45°;

7. Fix with cross self-tapping screws, use leather covers for fasteners, and screw caps must not be exposed.

8. The gap between the top and bottom openings of the ladder steps and the platform plate is less than 20mm.