The DORMA BTS 84 is a double action floor spring which has been specially developed for the aluminium and toughened glass door industries. This unit is intended to complement our internationally acclaimed RTS concealed overhead door closer by giving the shop-lifting industry the option of a DORMA quality floor spring designed for their particular purpose.

The BTS 84 has many of the features of the other DORMA BTS closers with the addition of reduced depth and an army of accessories designed for the aluminium door fabricator and toughened glass door manufacturer.

Plus points

For the trade
• Outstanding value for money.
• Also available with stronger and weaker springs for special requirements.

For the installer
• Easy installation thanks to shallow design.
• Easy to adapt to individual requirements with dual valve control 130° to 0° and 130° to 20°.
• Interchangeable spindle inserts available to suit site conditions.

 

For the architect/specifier
• Concealed unit for invisible installation.
• Minimum floor recess dimension.
• Proven, robust unit for door weights up to 100kg.

For the user
• Thermoconnstant smooth operation.
• High mechanical efficiency for easy door opening.
• Optional single point hold-open.

1) For applications involving, particularly high or heavy doors, and doors which have to close against wind or draught conditions, the next larger closer size or the DORMA BTS 80 should be selected.
2) Max. opening 130°. Door stop necessary for doors which can open further than 130°.