|Machine doors E1573 for use with Holywell ventilation telescopic steel stoppings in square work.
The design is well proven and originated in the USA (Jack Kennedy Metal Products & Buildings Inc.). The standard assembly is designed for squarework raodways of heights between 2.2 and 3m and provides a double door size of nominally 12'x5' with an aperture of 3.67mx1.61m. Roadway widths above 5.2m can be accommodated. If necessary a 12'x6' door size to provide a further 305mm headroom can be supplied.
The door assembly comprises uprights or support props, a lintel and pair of doors.Uprights are 2.5" tube with a telescoped tube fitted with adjusting nut, floor and roof plates. The roof has an articulating facility. The lintel locates over the telescopic tube to provide an upper sealing face. The doors are a very strong box section form and include seals to effectively close centre joint and edges. A handle, ventilation pressure release flap and lifting lugs are also incorporated. Doors are hung on inclined and horizontally displaced hinges to provide an automatic self-closing action. The stopping assembly is completed using telescopic steel stoppings above the door lintel and either side of the door props to the extremes of the roadway width. Onsite assembly and fitting is very simple (instruction details provided).
Application is generally against negligible ventilation pressure, however they are suitable for operating pressure to 3"WG. The door frame is designed to yield under convergence without effecting the door function.