System 1-30

Thermally Broken Top Swing Window

The Metal Technology thermally broken commercial top swing window 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

Size Limitation

Air Infiltration BS EN 1026 Class 3
Watertightness BS EN 1027 Class 9A
Wind Resistance BS EN 12211 Class E2400

BREEAM Sustainability Rating

A rating

Size Limitation

Widtht Height Vent Weight
1500mm 1500mm 600kg

Maximum height and maximum width cannot be achieved simultaneously. This table provides basic guidance. Please refer to size limitation charts in Metal Technology’s technical literature for further details.

Thermal Performance

Metal Technology System 1-30, in conjunction with the correct glass specification, is designed to aid compliance with the latest thermal requirements of the current building regulations.

System 1-30 CU-Frame Values
Fixed light outer frame 2.91 w/m2k
Outer frame and vent 3.23 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 / BS EN 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 thermally breaking.


Frame 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. Extruded weatherstrips and glazing gaskets are provided to resist the ingress of water.


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

  • Anodised to BS 1615 or BS 3987
  • Powder organic coated to BS 6496
  • Metal Technology's powder coating is produced to Qualicoat standards.


This system offers externally glazed sashes and fixed lights. Window can accommodate glazing units from 28mm to 36mm.

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