System 5-20 Hi+

Thermally Enhanced Tilt and Turn

Metal Technology's System 5-20 Hi+ offers the designer a wide and diverse range of profiles that will provide structural integrity, weather performance, thermal enhancement and security.

Performance Overview

Weather Performance - Independently weather performance tested to BS 6375-1

Air Infiltration BS EN 1026 Class 4
Watertightness BS EN 1027 Class E750
Wind Resistance BS EN 12211 Class E2400

Average air permeability’s under positive and negative air pressures at 50pa 0.79 m3/h.m2


Tested in accordance with BS EN ISO 140-3 and BS EN ISO 717-1.


This system has passed BS 7950 incorporating Amendments 1, 2 and 3 "Specification for Enhanced Security Performance" as generally accepted on Secure by Design products.

BREEAM Sustainability Rating

A rating

Window Energy Rating

B Rating

Size Limitation

Vent Section Vent Width Vent Height
Tilt Before Turn
130-230F 1000mm 1650mm
131-231F 1200mm 1800mm
132-232F 1500mm 2100mm
133-233F 1250mm 2400mm
132-236F 1437mm 2000mm
Tilt Only Sashes
130-230F 1000mm 1650mm
131-231F 1200mm 1800mm
132-232F 1500mm 2100mm
133-233F 1250mm 2400mm
Turn Only Sashes
130-230F 1000mm 1650mm
131-231F 1200mm 1800mm
132-232F 1500mm 2100mm
133-233F 1500mm 2100mm
132-236F 1250mm 2400mm

Note that maximum height and maximum width cannot be achieved simultaneously. For complete details of maximum/minimum sizes, handle positions and weight restrictions, see the size limitation charts in Metal Technology’s technical literature.

Thermal Performance

Metal Technology’s range System 5 20 Hi +, in conjunction with the correct glass specification, is designed to aid compliance with the latest thermal requirements of the current building regulations. The polyamide thermal break profiles have been specifically designed to minimise heat transfer across the window profiles.

Thermal performance is further improved through the introduction of specially designed thermal gaskets and foam profiles. These reduce radiation heat loss across the air cavities within the window profiles to provide additional thermal enhancement.

System 5-20 HI + U-Frame Values
Fixed light outer frame 1.91 W/m2K
Outer frame and vent 2.123 W/m2K

The following table, based on a standard commercial GGF window configuration and warm edge spacers, demonstrates how such improved U-frame values then contribute to improving the overall thermal performance of a complete window.

Metal Technology can provide tailored U-value calculations using their dedicated estimating software to calculate overall project average window U-values for their full range of systems.


Aluminium profiles are extruded from aluminium alloy 6060T6, T5, or T4 complying with the recommendations of BS EN 12020-2 / BS EN 755-Parts 1 to 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 thermally breaking.


Frame members are mitre cut at 45°, corners are reinforced with extruded aluminium crimping cleats and corner braces, and 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. Metal Technology recommend that only A2 or A4 Austenitic (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:

  • Anodised to BS 1615 or BS 3987 or BS EN 12373-1
  • Powder organic coated to BS 6496 or BS EN 12206-1
  • This system can accommodate a different colour finish internally to that used externally. 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. Fixed panes may be externally or internally glazed.

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