System 25 Hi+

Lift and Slide/Sliding Door

The Metal Technology System 25Hi+ Sliding / Lift and Slide Door has been designed to offer the specifier a sliding opener with pleasing site lines and all the benefits of weather performance, thermal enhancement and security.

Performance Overview

Weather Performance

Independently Weather Performance Tested to BS 6375-1.

Air permeability  BS 6375 Class 4
Watertightness BS 6375 Class 7A
Wind Resistance BS 6375   E2400

Information above is based on 1 Pane Lift and Slide / 1 Pane Fixed door

Size Limitations


Door Type


Door Sash Height

Door Sash Width

Max Weight



2800mm max

2100mm max


950mm min

500mm min

Lift and Slide


2800mm max

2100mm max


950mm min

770mm min



Door Energy Rating

B Rating


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

Thermal Performance

Metal Technology's  range, 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 door profiles. This innovative and advanced thermal break technology provides the basis of the 25Hi+ system.

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

The 25Hi+ system offers significantly improved U-frame values over more traditional thermally broken aluminium door systems.

  U-frame values
  25hi 25hi+
sliding / lift and slide door perimeter 2.86w/m2k 2.45w/m2k
sliding / lift and slide door interlock 3.86w/m2k 2 .67w/m2k


The following table, based on a standard door in accordance with BS EN 14351 (2000mm x 2180mm) and warm edge spacers, demonstrates how such improved U-frame values then contribute to improving the overall thermal performance of a complete door.

achievable whole
window u-values
centre pane u-values
1.0w/m2k 0.5w/m2k
25hi sliding / lift and slide door 1.63w/m2k 1.26w/m2k
25hi+ sliding / lift and slide door 1.49w/m2k 1.11w/m2k


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




Aluminium profiles are extruded from aluminium alloy 6060T6, T5, or T4 complying with the recommendations of BSEN 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 corner braces and mechanical cleats. All frame joints are sealed during construction against entry of water.



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

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

The system 25 Hi/Hi+ Sliding / Lift and Slide Door can accommodate a different colour/finish internally to that used externally.



The system can accommodate 28mm to 32.8mm glazing units. Glass is set against a captive gasket in the sash frame with a co-extruded wedge fitted internally. Special bridging setting / location blocks are provided to fit into the sections.

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