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BJL BJL
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6 years ago
Exit stairwells and other vertical shafts like those used for conveyor systems must maintain a fire rating of:
 
   45 minutes
   One hour
   Two hours
   Three hours
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omgjordinomgjordin
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6 years ago
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BJL Author
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6 years ago
Brilliant ツ
branbran2k16
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Yesterday
Thanks
bahajo
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2 hours ago
You make an excellent tutor!
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