The Dormakaba BTS80 EN4 Combi Packet is a complete, heavy-duty floor spring kit designed for concealed installation on single and double-action doors. This comprehensive pack includes the main floor spring body, a cement box for installation, a standard spindle, a durable bottom door strap, a top centre pivot, and a sealing compound. The unit has an EN4 spring strength, making it suitable for doors up to 1100mm wide and with a maximum weight of 300kg. The floor spring features adjustable closing speeds, an integral mechanical backcheck to protect the door and surrounding walls, and a temperature-independent, adjustable hold-open function between 75° and 175°. The kit is finished with an aluminium cover plate, providing a clean and professional appearance for a variety of door materials, including timber, glass, and aluminium.
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