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A platform for research: civil engineering, architecture and urbanism
Mine safety board decision 29; doors for controlling ventilation in coal mines
Recommended specifications; That doors shall be installed in pairs to form air locks; shall be self-closing; shall not have latches or other devices for holding them open; shall be constructed and maintained to prevent excessive air leakage through or around them; shall be fire resistant; that wherever practical, use of doors shall be limited to development openings.
Mine safety board decision 29; doors for controlling ventilation in coal mines
Recommended specifications; That doors shall be installed in pairs to form air locks; shall be self-closing; shall not have latches or other devices for holding them open; shall be constructed and maintained to prevent excessive air leakage through or around them; shall be fire resistant; that wherever practical, use of doors shall be limited to development openings.
Mine safety board decision 29; doors for controlling ventilation in coal mines
U S Bur Mines -- Information Cir
1938
2 pages
Report
English
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