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 elevator hoistway, 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。
The first step is to close all vents and openings at the top of the hoistway to prevent water from entering the elevator shaft.
第一步是关紧电梯井道上方所有的排气口以及出口，防止水进入电梯井道。
The first step is to close all vents and openings at the top of the hoistway to prevent water from entering the elevator shaft.
第一步是关紧电梯井道上方所有的排气口以及出口，防止水进入电梯井道。
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