Cylinder Length: 142 mm Cylinder Diameter: 22 mm Plate Size: 51 x 25 mm features: Perko Door Closer A door closer for light or medium weight internal doors. Maximun door weight 50 kg Designed to be completely concealed when the door is closed, and compact enough to be unobtrusive when the door is open The closer comprises a small chain anchored at one end to a rectangular end plate which is screwed to the door jamb and connected at the other end to a spring contained within a steel cylinder which is fitted into the butt stile of the door The spring is compressed when the door is opened, and its extension when the door is released acts through the chain to pull the door closed again The Perko is British designed, developed and manufactured. Applications: To provide automatic closure of light and medium weight internal doors weighing up to 50.8kg, except those fitted with rising butt hinges, Parliament or projecting hinges or where limited air displacement conditions exist The distance between the centres of two fixing plates must not exceed 45mm when the door is opened to its maximum. Should this distance be exceeded, eg through the use of wide-knuckled hinges, a door stop should be fitted at the appropriate distance Successfully fire tested to BS EN 1634-1:2000, providing verification of suitability for half hour and one hour fire doors The Perko is manufactured under a BS EN ISO 9001: 1994 Quality System. The closer also has UL and cUL approval and its listing control number is 85R6. Manufactured by Samuel Heath and sons, Birmingham