Suitable for doors up to 1100mm (W) with maximum 300kg leaf weight. Dorma BTS80 Floor Spring Door Closer EN4 includes a cement box and standard spindle. It is a universal non-handed floor spring for single and double action doors. With adjustable closing speed and closing action from approximately 175°, with hydraulically controlled closing cycle and mechanical back-check. Integral pressure compensation feature allows for temperature independent hold-open between 75° and 175° (removable). Hold-open start point and delayed action is easily adjustable using the valve.