System 5-20D

Thermally Enhanced Door System

The Metal Technology thermally broken 5-20D door system has been designed to offer the specifier the advantages of polyamide thermal break technology in meeting the latest thermal requirements of the current building regulations.

Performance Overview

Weather Performance

Independently Weather Performance Tested to BS 6375-1.

Air Infiltration  BS EN 1026 Class 4
Watertightness  BS EN 1027 Class 9A
Wind Resistance BS EN : 12211 E2400


Information above is based on single leaf open out fully rebated door.

BREEAM Sustainability Rating

A+ Rating


This system  has passed PAS 24 "Enhanced Security Performance Requirements for Door Assemblies" as generally accepted on Secure by Design projects.

Size Limitation


Door Sash Door Sash Height. Door Sash Width.
Single Door 2400mm max. 1200mm max.
1961mm min. 650mm min.
Double Door 2400mm max. 1000mm max.
1961mm min. 650mm min.


Thermal Performance

The Metal Technology 5-20D Door System, in conjunction with the correct glass specification, is designed to aid compliance with the latest thermal requirements of the current building regulations.


Aluminum profiles are extruded from aluminium alloy 6060T6, T5 or T4 complying with the recommendations of BS EN 12020-2 / BSEN 755 Parts 1- 9. Polyamide thermal breaks are produced from glass reinforced nylon sections designed to withstand temperatures in excess of 200°C, allowing the sections to be powder coated after thermal breaking.


Frame and door sash members are mitre cut at 45°. Corners are reinforced with extruded aluminium crimping cleats and corner braces. A secure joint is formed by pneumatically crimping into the extruded crimping cleat. Mullion and transom bars are square cut, shaped and fixed securely to the frame by means of stainless steel screws and fixing cleats.
All frame joints are sealed during construction against entry of water using Metal Technology's two part adhesive. Extruded weatherstrips and glazing gaskets are provided to resist the ingress of water.

Metal Technology recommend that only A2 or A4 austentic (300 series/class 70) stainless steel fixing screws are used in the assembly of their products.


The range of sections can be provided in either of the following ranges of finishes:

  1. Anodised to BS 1615 or BS 3987 or BS EN 12373-1
  2. Powder organic coated to BS 6496 or BS EN 12206-1

Metal Technology's powder coating is produced to Qualicoat standards.


This system offers internally glazed sashes and can accommodate glazing units from 24mm to 34mm units.

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