System 26 Hi/Hi+

High Performance Thermally Enhanced Bi-Folding Door

Metal Technology’s thermal range of Bi-Folding doors are the perfect solution to open up your home and bring the outside in, while keeping the elements out. Our Bi-Fold doors offer a wide range of designs from two to seven panes and up to 6 metres in width giving architects, clients and specifiers total design flexibility. The door can also be used in a single door application. Door sashes can accommodate either open in or open out applications, with an option of either curved or flush profile door leaves or fully rebated or low thresholds.

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 E1800


BREEAM Sustainability Rating

A+ Rating


To ensure your home is protected, the Bi-Fold door incorporates high security locking mechanisms throughout. The door has been designed and tested to comply with security standard PAS24 in accordance with the criteria for Secure by Design. All glazing units are internally beaded.

Size Limitations

Door Sash Door Sash Width Door Sash Height
Maximum 1000 2500
Minimum 700 1900


Door Energy Rating


Thermal Performance

Metal Technology’s   Bi-Fold doors offer exceptionally low U values using bespoke polyamide thermal isolators designed to minimise heat transfer across the door profiles. This can be further enhanced with a high insulation (Hi+) option of uniquely designed cellular foams which enclose internal cavities within the profile, further reducing heat loss and providing one of the most thermally efficient systems available.

achievable whole
window u-values
centre pane u-values
1.1w/m2k 0.6w/m2k
System 26Hi Bi-Fold * 1.64w/m2k 1.25w/m2k
System 26Hi+ Bi-Fold * 1.42w/m2k 1.03w/m2k


* Door U values based on 3000 x 2200m three pane Bi-fold using warm edge swiss spacer V bars and fully rebated thresholds.

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.


Aluminum 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 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. 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:

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

The system 26Hi/Hi+ Door 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 28mm to 50mm units.

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