OPERATION: This shutter has a soldered fusible link designed to melt at 68 degrees centre grade in a fire condition separating and releasing the shutter curtain allowing the shutter to close in a controlled manner. Testing of the door is done manually as is opening and closing the door, using a 418-volt 3- phase 50Hz motor drive. Emergency operation is via a manual hand chain.
CURTAIN: Constructed from solid 75mm curved galvanized steel interlocking lath sections manufactured to BS EN 10142 and BS EN 10143 with a zinc coating of 275g/m2 complete with zinc-plated mild steel end locks Curtain is available in 20swg (0.91mm) or 18swg (1.22mm) finished at the bottom with a galvanised steel ‘T’ shaped bottom rail.
GUIDES: Constructed from 65mm or 102mm x 32mm x 3mm thick galvanised steel channel manufactured to BS EN 10142 and BS EN 10143 with a zinc coating of 275g/m2, complete with splayed tops, bolted to 75mm x 50mm x 6mm thick continuous mild steel angle sections manufactured to BS4848 part 4, complete with 12mm x 50mm slotted fixing holes positioned at 550mm maximum centres.
HOODS: Constructed from 20swg (0.91mm thick) galvanised steel sheet manufactured to BS EN 10142 and BS EN 10143 with a zinc coating of 275g/m2, and fitted with hood support brackets constructed from mild steel angle sections manufactured to BS 4848 part 4 and finished with a zinc-rich primer paint as standard. The hood brackets support the hood and help to provide a fire seal at the head in the event of a fire. The number of support brackets used is determined by the width and fire resistance of the shutter.
BARREL: Constructed from high quality mild steel tube manufactured to BS EN 10219. Overall size of the tube varies to suit the width of the opening and weight of the shutter curtain. Tube wall thickness varies depending on the size of the shutter from 3.2mm to 19mm to achieve minimum deflection and a safety factor of 2. Barrels come complete with tempered steel helical torsion springs manufactured using hard drawn wire to BS 5216mounted on bright steel shafts of various diameters from25mm to 50mm
SHAFT: Shafts are held in place using mild steel bearing blocks incorporating high-speed bearings to ensure concentric rotation.