Fire rated shutters are often required on commercial or public sector properties where there is a risk of fire. The shutter will stop the spread of fire from a designated area for the hour rating specified by the manufacturer.
Having created the technical files and been involved in the testing of our fire shutter, we at SD Installation can ensure that order, installation, and commissioning of fire shutters meets the technical requirements of a fire shutter.
Our fire shutters resemble standard steel single skin roller shutters, but are usually heavier gauge steel, with some additional features. Fire shutters can be designed and fitted so as to close under a variety of circumstances, from a simple alarm signal, to increase of heat (and activation of a fusible link), manually operated closure or, finally by simple use of an impulse switch / key switch. Please see the datasheets below for further information, or contact us now to talk through your project.
Designing and Testing the Fire Shutter
Our Fire Shutter was tested at Exova WarringtonFire at the end of 2011; the test specimen was submitted by Aluroll Ltd, Oswestry. The purpose of the test was to discover the fire separation function.
The rolling shutter assembly comprised a mild steel barrel supporting a galvanised mild steel lath curtain and was fixed to the exposed face of a masonry wall to cover an aperture with an opening size of 2400mm high by 2500mm wide, such that the barrel assembly was exposed to heating conditions of the test.
The specimen was fixed with specific bolts for brick onto an opening formed brick. The whole brick formation with an opening in it covered by the Aluroll fire shutter was then lifted with a crane into place over the opening of a furnace. This is the typical method by which shutters are tested, and follows the BS EN 1634-1: 20008 standard.
Once the burner or furnace was lit, temperatures rose to 979'C after one hour. By the fourth hour, the unexposed side of the fire shutter had a temperature of 810'C, and after 50 minutes was radiating 25kW of energy in the form of heat for every meter square.
The shutter did not, therefore, show a great deal of insulation against heat radiation; however, the purpose of the test was to determine whether flaming would escape through the shutter to the other side of the brick aperture.
The test as described applied specifically to the 2.5w x 2.4h shutter build type. An assessment is typically carried out later, as an engineering analysis of of the materials used, in order to work out how the same model could be built larger than 2.5x2.4m, and retain its fire protection qualities. Based on this, the Aluroll shutter can be built to 50m2, or greater. The standard which permits this extension is BS 476: Part 22: 1987, Method 8. A file of recommendations is issued to the manufacturer which must be adhered to strictly when designing and building the shutters.
To put it briefly, the amendments to the original shutter models apply to: mild steel barrel size and thickness; slat thickness; motor fixing bolt sizes; and whether a barrel support frame to catch the barrel when it deflects, should or can be used. Deflection of barrel and slat is a natural consequence of heating them: they expand and therefore bend or deflect. The consequences include gaps forming at the bottom or top of the shutter, which means flame escaping through the barrier.