This is the most commonly used type of operation method among other.
Most highly suited to use in smaller applications door that requiring no hand chain & work using the tension of the spring only. When the shutter is fully closed, the standard dual locking system makes almost impossible to open from the outside. The dual locking system consists of horizonal bar locks on the bottom bar or shutter’s panel. It was also available with inside and outside key locking systems and steel bar pack lock.
On this operation method is another highly recommendation to be used in heavy duty type of roller shutter, which it is manually using the chain block to control the operation of roller shutter.
Most ideally suitable to industrial application, the curtain of the door is manually raised via a continuous haul chain which drives the fully spring counter balanced roller barrel assembly…
On this more convenient operation method compare to the other, Is another ideally recommendation to all users.
The motorised operated roller shutter allowed for the operation of much larger shutter often without the need for a centre stanchion which can be unsightly. Meanwhile, the motorised operated is equipped with a manual overriding system, in the event of a power failure, the users can still operate the roller shutter manually.