ALT BF 73 – French or double doors

Swing doors designed using the same BF 73 system to complement our bi-folding door range, demonstrating the versatility of this system, with minimal sight lines and stylish hardware to suit any application, either as open-out or open-in, single or double doors. These make ideal access doors or for smaller apertures.

Designed using the same material to compliment the bi-folding door with minimal sight lines and stylish hardware to suit any application.

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BF73 French doors/Double doors Product Information


Our BF73 bifold doors are designed as a sleek modern system that is Fabricator and Installer friendly.
The BF73 has aesthetic qualities that will delight the end user and robust running gear ensure smooth operation of the doors and minimal maintenance.
Weather rated standard threshold with an option for low threshold and ramp for ease of access. There are also a range of sub cills to suit site requirements.
The optional adjustable jamb offers easier installs with 4mm tolerance.
120mm Super Slim sightline stile to stile ensure maximum glass expanse to suit the most demanding commercial or residential project and location.
Security to PAS 24 rating ensures insurance approval and peace of mind. Fabricators can achieve this with some minor upgrades on the hardware.
A U -Value of 1.4 can be achieved by way of triple glazed units, with 28mm double glazing offering 1.6 to meet building regulations.
A myriad of configurations are available with market leading sash width up to 1200mm and 3000mm height, to confirm the BF73 bifold door as the system to specify
The floating corner post option enable the doors, including return, to open out fully, giving the end user that wow factor! (structural support needs to be in place).
UK stock holding include the leading colour choices plus a range of dual colours. We also offer bespoke non stock options to order
All profiles are extruded to the highest quality and we can also offer marine coating for coastal site locations
Alutech Group as standard have a 10-year warranty on factory powder coating and hardware. Copy certification available on request

Technical Data

U value W/m²K (Double glazing)1.6 W/m²K
U value W/m²K (Triple glazing)1.4 W/m²K
Air Permability BS EN 1026Class 4
Watertightness BS EN 1027Class 9A
Wind Resistance BS EN 12211Class A3
Security PAS 24
Certifications available
Punchtool available
Jigs Available
Direction of openingOpen in & Open out
Maximum Frame width16.8m
Maximum amount of panes sliding one way7 panes
Maximum sash width1200mm
Maximum sash height3000mm
Standard Sash meeting stile sight line120mm
Heavy Sash meeting stile sight line133mm
Frame width81mm
Maximum sash weight120kg
Frame depth73mm
Paint standard and thickness Qualicoat, 60 microns | Qualanod, 20 microns
Dual colour option availability
Concealed and face fixed hinge options
Glazing optionsInternal
Glazing thickness28mm, 32mm, 35mm, 44mm
Hardware SupplierDebar
Option 1 - Manual cornerScrew
Option 2 - Crimped corner
Threshold options20mm or full framed option
Half roller or sliding post possibility
Cill Options90mm, 150mm, 190mm, 230mm
Multi point locking

Benefits of choosing Alutech Systems


Our philosophy is that of the MD of our company – nothing should be too much trouble. We make it work for our clients and keep it personal


The key to the speed of fabrication is down to our punch tools – by having two punch tools we have saved over an hour to fabricate a door. Less labour increased production/profits.


Before any new client starts manufacturing, we invite you to our training facility to learn the short cuts and be 100% confident with the product


Over £1m of pre-painted stock is stored in the UK ready for immediate delivery. Standard colours include for White, Black, Grey, Mill, Grey on White and Black on White.

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