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In NFPA 13 - 2016 it's clearly stated at that ESFR sprinklers shall be installed only in buildings where roof or ceiling slope above the sprinklers does not exceed a pitch of 2 in 12 (a rise of 2 units in a run of 12 units, a roof slope of 16.7 percent). ( 9.5 Degrees ) .   What if the slope is a little bit steeper than 9.5 Degrees , at… (Show more)
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Electron and charge To know electricity, we must first explain electrons and charges.  I'm sorry for suddenly difficult story. The smallest unit of matter is an atom, which consists of a central nucleus and electrons rotating around it. The protons in the nucleus are positive and the electrons are negative (charged). This charged substance… (Show more)
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INo open holes or breaks exist in surfaces of either the door or frame. Glazing, vision light frames and glazing beads are intact and securely fastened in place, if so equipped. The door, frame, hinges, hardware and noncombustible threshold are secured, aligned and in working order with no visible signs of damage. No parts are missing or broken.… (Show more)
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