NBS Source
Folding Sliding Steel Door FE


Four-leaf door, 3:1 coupled, double skinned with PUR foam core. Door leaf 50 mm thick, with vertically arranged rubber accident prevention profiles.

Fixing applications:

  • Masonry.
  • Concrete.
  • Autoclaved aerated concrete.
  • Steel construction.

General information

Uniclass 2015

Pr_30_59_24_81 Sliding folding doorsetsPrimary


L20/530 Sliding folding external doors

Specification data - Sliding folding doorsets

Product Reference

Teckentrup 50"


Bonded mineral wool

1.5 mm sheet thickness.

Mineral wool

1.75 mm sheet thickness.

PUR foam

1 mm sheet thickness.

Colour/ Finish

Polyester powder coated, RAL

Similar to RAL 9016, not available with mineral wool core.

Galvanized natural

With mineral wool core only.


Optional, consult manufacturer and insert requirements.


As drawing

Not required


Various items of special equipment are available, consult manufacturer and insert requirements.

Standard product features

Door leaf:

  • Double skinned.
  • Thickness: 50 mm.

Door frame:

  • Side frame: 50 x 90 mm square tube.
  • Upper frame: U-profile with guiding rail and release layer.
  • Bottom: With threshold.


  • Two-piece three roller steel hinges with ball bearings (galvanized).
  • Guiding rails with ball-beared plastic roller.
  • Surface mounted basquill lock inside, prepared for profile cylinder and handle set (black) on the outside for access door leaf version.
  • Wicket door with mortice lock.
  • Mounted folding door basquill with locking rod with separate handle.
  • Leaf hold open device.


  • Laminated safety glass 6 mm thick.
  • SAN double glazing 18 mm thick (aluminium frame only).
  • Double laminated safety insulation glass (VSG/ VSG) 21 mm thick (with aluminium clamping strips or rubber clamping profile).

Test data:

-Based on folding door 3480 x 3550 mm opening outwards with bottom threshold:

  • Wind resistance (DIN EN 12424): Class 4 (2500 Pa).
  • Air permeability (EN 12427): Class 4.
  • Water ingress (EN 12489): Class 3.
  • Sound insulation (ISO 717-7): Maximum Rw 32 dB (mineral wool infill).
  • Heat insulation (EN ISO 12567-1): 1.9 W/m²k (PU-foam infill).