... by dead weight.5, There is a thermal protector in electromotor, which has the function of superheating protection.6, ... on the roller shutter door is pressed by appointed man in order to guard against theft3,Product Technical Parameters ModelFJJ ... , warehouse, garage, factory ,hotels and so on.PackingPacking in cartons fill with foamCertificateISO9001:2008 ; CCCDeliveryDelivery time is determined ...