Duration Windows - Aluminium Windows and Aluminium Doors Trade Manufacturer | Bi-folding Doors, Heritage Steel Replacement Windows, Secondary Glazing Supplier

Recommended Sizes

Guidance Only

Min. Width (mm): 1400
Max. Width (mm): 6250+
Min. Height (mm): 1600
Max. Height (mm): 2300*
Max. Panel Width (mm): 1000
Max. Weight Per Panel (kg): 100

*Subject to site conditions. Sizes shown are for guidance only. Maximum widths can vary depending on chosen height and vice versa. Widths wider than 6250 can be achieved with a mechanical join. Panels can also be made less than 700mm wide — please ask our technical department for advice.

Key Profile Dimensions

System Detail

Outerframe Depth (mm): 76
Sash Depth (mm): 75
Glazed Sealed Units (mm): 24, 28
Projection Cill Height - Optional (mm): 25
Head Extension - Optional (mm): 42

Heritage bifold profiles are designed to deliver slim steel-look styling with practical modern aluminium performance.

Sight Lines

Slimline Look

Head / Top (mm): 88
Jamb / Side (mm): 106
Meeting Stiles (mm): 94
Bottom - With Std. Threshold (mm): 88

Bottom sight-line and step height figures shown are the optimum / best-case scenario for open-out doors that have been sunk or dropped into the floor.

Bifolding Door Performance

Test Data

✔ Complies Regulations

600 Pa Air Permeable

450 Pa Water Tightness

1200 Pa Wind Resistance

NB: Subject to testing. These statistics apply for a suitable glass unit.

Specifying - Suitable Applications

Where To Use

Can be specified for residential / domestic applications.
Meets building regulations for new build. (For Oct 2010)
Meets building regulations for replacement and refurbishment projects. (For Oct 2010)
Standard fully weather rated threshold; suitable for use up to second floor and exposed locations.

Opening Styles

Configuration Guide

Please note: doors shown are all viewed from the outside. All doors can be made to open in or out. There is no cost implication to choosing open-in or open-out doors.