Construction
Slats
The slats are made of superior zincalume steel coils punched with perforated holes of 2.5mm diameter spaced at 3mm, which are roll formed into 75mm slats. The slats have reinforced interlocking profile with their edges cut-off to (end) lock the axial movements.
Side guides
The standard guide rails are cold rolled using 3mm thick galvanized steel coil to a ‘U’ shaped profile. Sizes range from 60mm by 36mm for opening widths of less than 3.5m, and 90mm by 36mm for larger shutters. Optional heavy duty 3mm thick aluminum guide rails that are 75mm by 75mm can be provided with PVC weather strips as an option.
Bottom bar
The bottom bar is an ‘L’ shaped aluminum profile made from heavy duty extruded aluminum alloy that is 60mm high and 60mm wide. The bottom of the bar has dovetail grooves to receive the PVC weather-seal.
Shutter box
The shutter box is made out of two heavy duty steel endplates of thickness 4mm to 7mm according to the size of the shutter; joined together using five steel hollow sections of 50mm x 25mm, primer finished in black. Two 50mm x 50mm x 4.5mm thick steel angles with slotted fixing holes are welded with the end plates to fix the shutter box to the building structure.
Barrel
The barrel is made of a heavy duty seamless steel pipe, welded with axles of dia 35mm to dia 50mm according to the size of the shutter. This barrel is fixed to the right and left endplates with heavy duty sealed roller bearings.
Box Cover
The shutter box covers are made out of 0.8mm thick zincalume steel sheets, with the edges folded to provide rigidity.
Operation
Motor
The motor is suitably sized with a fully enclosed design. The motor has a high starting torque, built-in gear box and a built-in thermal protector. The motor gearbox has a inbuilt centrifugal type speed governor that ensures safety in the event of a free fall. In case of power failure, an endless hand chain is provided for manual operation from the ground level. Adjustable limit switches are used to set the upper and lower limit for the travel of the curtain.
Push button control
Push button control with ‘up’, ‘down’ and ‘stop’ buttons are housed in a lockable push button box. The outer cover of the push button box is made of stainless steel. Weatherproof NEMA rated push button boxes can be provided as an option.
M&E Requirements
Power
1 phase, 230V, 50Hz, 13A / 3 phase, 415V, 50Hz, 20A power supply at shutter box location.
Options
Safety edge: The safety edge is fitted to the base of the bottom bar and stops downward travel of the curtain when obstructed and automatically reverses the travel. The moment the safety edge touches an obstruction, the pressure switch activates the logic control of the motor remotely without the need of cables, and reverses the direction of the motor.
Remote controls
Wind locks to provide additional stability in high wind exposed applications
Bottom bar weather seal
Removable sliding mullion for applications exceeding stated maximum widths.