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Standard electrically operated doors .Activating the manual override ,which starts closing function, chain pulley during power failure .Thermal auto cut-off switche activates during temperature and will auto-reset at normal temperature to prevent damages if operator continues to run. A fuse prevents it from being short-circuit or extreme current fluctuation. |
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Shutters can be supplied self coiling push up to operation. Shutters above this size should be either hand chain or hand wheel , mechanically gewared or electrically operated . Hand chain operation allows the shutter to be operated from one side only . Hand chain wheel operated allows operation from both sides. |
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