System 5-20DHi+ Doors



Profiles are extruded from aluminium alloy (6060 T6, T5 or T4 to BS EN 12020-2/ BS 755-9) and with polyamide thermal break sections manufactured from glass reinforced nylon sections capable of withstanding temperatures in excess of 200°C. Outer frame sections are a minimum of 50 mm deep incorporating two 20 mm polyamide thermal break sections within the door profiles.

Joints in outer frame and vent members are formed with 45 degree mitres, reinforced with extruded aluminium cleats and stainless steel corner braces. Corner joints are secured by pneumatic crimping. Mullions and transoms are secured using stainless steel screws driven into integral screw ports within the sections: additional cruciform cleats are used where required. Joints are sealed using a small gap sealant.

Doors incorporate an internal pressure equalized drainage system with external ‘snap-on’ cover caps.


With suitable glazing, doors can contribute to meeting the requirements of Building Regulations for conservation of heat and power. Consult Metal Technology for recommendations and details.

The doors provide Class IV weathertightness as defined by BS 6375-1:

  • Air permeability: 600 Pa.
  • Watertightness: 600 Pa.
  • Wind resistance: 2400 Pa.

Design wind pressure to be determined in accordance with BS 6399-2.


Lugs and/ or frame anchors used to secure windows to the building structure must accommodate predicted loads and deflection within design tolerances. Generally, fixings must be positioned 150 mm from each corner and each mullion/ transom, and at centres not exceeding 600 mm. Fixing lugs/ straps should be used only where they can be suitably concealed.

Secured by Design:

System 5-20DHi+ doors have been tested in line with PAS24 security standards and are certified by a UKAS accredited certification body.

General information


As drawing

As schedule


Extruded aluminium alloy 6060 T4

Extruded aluminium alloy 6060 T5

Extruded aluminium alloy 6060 T6

Uniclass 2015

Pr_30_59_23_53 Metal door leavesPrimary


L20/280 Doors

L20/60 Doors

Specification data - Metal door leaves

Product Reference

System 5-20DHi+ Thermally Enhanced Commercial Doors


As drawing

As schedule


Extruded aluminium alloy 6060 T4

Extruded aluminium alloy 6060 T5

Extruded aluminium alloy 6060 T6



Internal colour

Insert requirements.


Insert requirements.

Glazing details

Insert requirements.

Glazing method

Factory fitted

Site glazed


Not required

Required, System 23 Aluminium Louvre

Ironmongery/ Accessories

Consult Metal Technology Ltd with requirements.

Standard product features


In commercial applications, Metal Technology’s thermally broken low rise ramped threshold detail is utilized. All threshold bars are suitable for wheelchair access.

Product Options

Finish (as delivered):

Aluminium sections are polyester powder coated to BS EN 12206, with the option of different interior and exterior colours. Consult Metal Technology for availability of colours and to obtain samples.


Doors can accommodate a range of insulating glass units and can be glazed in the factory or on site. Doors are dry glazed using ‘snap-in’ extruded aluminium beads with colour coded, co-extruded, PVC nitrile, captive ‘E’ gaskets externally and ‘wedge’ gaskets internally. Consult Metal Technology for recommendation and details.

Ironmongery/ accessories:

Different door configurations, ironmongery selections and options are available and consultation between the commissioned Design Team and Metal Technology’s Regional Architectural Advisor on all ironmongery options is advised.

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