folding stairway,stair,access gangwaysafe load-bearing 200 KG Thermal insulation 1.1W/m2K frame size 600/700x1200mm step length 380mm step width 120mm step thickness 30mm anti-fire 30minutes safe load-bearing: 200 KG Thermal insulation: 1.1W/m2K frame size: 600/700x1200mm step length: 380mm step width: 120mm.