Elastic mid-strength rock wool board: used for heat preservation, fireproofing and sound absorption for the building wall/roof, such as curtain wall, inner wall partition and elevatorhoistway, etc.
有弹性，中等强度岩棉板：适用于建筑墙体/屋顶保温、防火、吸音，如幕墙、内墙隔断、电梯井等。
2
The first step is to close all vents and openings at the top of the hoistway to prevent water from entering the elevator shaft.