The Shutter Curtain is fabricated from interlocking 76mm galvanised steel laths with ends of alternate lath. A cold rolled galvanised ‘T’ section base bar finishes the bottom of the curtain. Two mild steel end plates support the roller barrel. The barrel is fabricated from steel tube of sufficient strength to span the opening width and to carry the curtain. Built into the barrel is a shaft of 30mm diameter with bronze oilite bushes contained in cast iron cones.
The shutter barrel is driven through a simplex roller chain drive, the hand chain operating a chain wheel. A retaining bracket mounted on the side guide at low level locks the hand chain.