Bifolds are a popular and versatile window, with a wide opening to maximise views and airflow. Bifolds play a wonderful role in connecting the inside to the outside.

Bifolds are available as standard or in a Inline version, which folds back flush with the exterior cladding.

WT Bifold window

Bifold Window Configurations

Colonial Glazing Bars     Passive Ventilation     Hardware     Jamb Liners     Flashings


Maximum sizes for bifold windows vary by width, height, wind zone, and glazing requirement. Your local Bradnam's branch will be able to advise you whether a configuration is possible or contact Altus Technical support.

As a guide, bi-fold window panels up to 1.4m high by 0.8m wide are recommended.

Frame Types

Glazing, Beads and Panel Types



Window Ventilation

Aluvent passive ventilator enables passive ventilation to be included into all bi-fold window panels. Refer to the Aluvent section.



A standard range of flashings include 95mm, 84mm,71mm, 68mm, 63mm, 58mm, 53mm, 48mm, 45mm, 41mm, 38mm, 31mm, 25mm and 14mm. These have been designed to comply with E2/AS1 Amendment 6 requirements. Refer to the flashings section.



Proprietary Altus NZ Limited bifold hinge and bifold roller assemblies are critical components to provide attractive visual and functional performance of doors and windows. Refer to the hardware section.