The shutter curtain is constructed from ribbed galvanised steel sections designed to provide 85mm deep, twin skinned hollow interlocking laths with a thermal in-fill material. The heat loss / ‘U’ value for the lath is approximately 0.69 W/m²K. As standard, hardwearing nylon endlocks are riveted to both ends of each lath to prevent lateral movement.

Options

In most cases, the following lath options are available for either or both skins: Colorcoat HP200 plastisol coating; polyester powder coating; aluminium and stainless steel. Purpose designed double glazed vision panel(s) are also available.

The bottom lath of the shutter is terminated with a steel ‘U’ channel and retainer with rubber weather seal.

Specially designed vertical brush strips are fitted to both the inner and outer face of the guides. A nylon brush strip is provided to bridge the gap between the soffit and shutter curtain.

The barrel, which is usually fixed behind the lintel, is constructed from mild steel tube of sufficient diameter and wall thickness to withstand deflection and twist during operation. Counter balancing is achieved by helical torsion springs mounted on a steel shaft incorporated within the barrel and greased on assembly. Spring and shaft supports are cast iron.

Supporting brackets are constructed from mild steel plate mounted on mild steel angle cleats for fixing to the lintel and are of appropriate size and thickness for the weight and dimensions of the door. Cast iron or welded steel cups are fixed to the end plates to receive the barrel’s centre shaft.