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DORMA BTS-80 System Floor Spring (EN4 / EN6) 多瑪牌 銀色地較/地彈簧 BTS-80 (EN4/EN6) BTS80地彈簧有很強的通用性，單雙開門地彈簧系統,適用多種門扇情況。額外的許多獨立功能，能夠滿足各種應用要求。安裝到地面後，該裝置完全隱藏。
DORMA BTS 75 V Floor Spring - Maximum Reliability and Quality. The BTS 75 V is a highly adaptable floor spring suitable for all standard single and double action doors and for exterior doors with widths up to 1.100 mm. Universal application range, individual functions, assured quality.
The BTS80 Series of floor-concealed door closers offer adaptability to almost any installation. The closer’s compact body permits its use where a larger closer would be prohibitive. Versatility allows installation in thin slab concrete subfloor construction.
Successfully tailored to satisfy the special requirements governing floor springs for double action doors, the BTS 65 also offers a particularly shallow design and thus all the advantages of a reduced installation depth.
Floor spring specially designed for double action doors. Developed to meet the special requirements of door closers for double action doors, the BTS 84 floor spring has a particularly shallow design, allowing it to be installed very effectively in the floor.
As a universal floor spring, the BTS 80 has been designed to meet the requirements of doors of all types. With its many individually combinable extras, it is able to satisfy almost every application requirement.
dormakaba floor springs meet exacting demands for user convenience as well as requirements for specific functions: the BTS 80 EMB floor spring with its electro-hydraulic hold-open function and the BTS 80 FLB with its free-swing function.
