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Double 55 vertical shaft impact sand making machine

Feb 29 2012 The rating must be equal to the rating of the hoistway IBC Section 30021 requires that hoistways comply with Section 713 for shaft enclosures therefore if the shaft connects four or more stories then the hoistway and the machine room must have a fireresistance rating of 2 hours or 1 hour if connecting fewer than four stories

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Kexue Revenue, High and New Technology Industrial Development Zone, Zhengzhou, China

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