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。

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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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