NBS Source
AA®3720 Folding Sliding Door


The AA®3720 Folding/ Sliding Door is a solution for projects that demand the highest levels of thermal and weathering performance. The product uses advanced thermal break technology, ensuring thermal efficiency and full compliance with Building Regulations (E&W) Approved Document L. The polyamide thermal break allows for single and dual colour options. The use of extruded gasket profiles, and a drain and ventilate strategy, enable the system to achieve its weathering performance.

Features/ benefits:

  • Highly insulated profiles with U-values as low as 1.8 W/m²K for frame/ vent combinations; U-values as low as 1.0 W/m²K at the maximum panel size (using 0.7 W/m²K triple glazing and warm edge technology).
  • A range of door configurations in either open-in or open-out stack variants – total flexibility for all project applications.
  • Panel sizes up to 1200 x 2930 mm (w x h), dependent upon glass size and weight. Can achieve solutions in the most demanding of applications.
  • Slim sightlines – no floating mullions. Reduced metal content and increased fabrication efficiency.
  • Stainless steel rollers for smooth and effortless operation.
  • Choice of threshold options – continuity between internal and external spaces. Rebated, low and sunken track options to add further design capability.
  • Innovative design features – patented technology, providing premium product performance.
  • Suites with the AA®720 Window Series – total design flexibility offering total project solutions.

General information


Insert requirements. 1500 x 2400 mm (w x h, frame maximum).

Uniclass 2015

Pr_30_59_24_52 Metal doorsetsPrimary


L20/530 Sliding folding external doors

L20/55 Doorsets

Specification data - Metal doorsets

Product Reference

AA3720 Thermally Broken Aluminium Bi-Fold Door


Insert requirements. 1500 x 2400 mm (w x h, frame maximum).


Insert requirements.


Open in

Open out


Softline - rounded contours


Square box (security)




Permacover polyester powder coated

Permanodic anodized

Film thickness

40 micrometres

60 micrometres

80 micrometres


Insert requirements.

Standard product features

Weather performance:

  • Air permeability: Class 4 (600 Pa).
  • Watertightness: Class E750 (750 Pa).
  • Resistance to windload: Class A5 (1600 Pa).

Product Options


Weathering is achieved by the use of EPDM gaskets and woolpile. The door is designed to be pressure-equalized and fully drained.


Independently tested to PAS 24. Does not refer to standard hardware; security hardware required.

Enhanced thermal option:

The addition of simple thermal shields divides the thermal chambers further to improve the thermal performance with minimal additional cost or fabrication. Enhancements of 0.1 W/m²K are possible with this addition.

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