Sightline
The visible width of the frame and sash when looking at a closed bifold door. A slimmer sightline means more glass and less visible frame.
Door hinge
The mechanism that allows a door to swing open and closed, connecting the door to the frame.
Bifold hinge
A specialised hinge that allows bifold door panels to fold and stack neatly against each other when opened.
RAL colours
A standardised colour matching system used in powder coating, offering a wide range of colour options for bifold doors.
Drainage
The system built into the door frame to channel water away, preventing it from entering your home.
Threshold
The bottom part of the door frame that you step over. Can be standard height or low-profile for easier access.
Jamb
The vertical side post of a door frame, against which the door closes.
U-value
A measure of thermal efficiency; lower U-values indicate better insulation properties.
Thermal break
An insulating barrier within the door frame that separates the interior and exterior surfaces, improving thermal efficiency.
Traffic door
A single door within a bifold system that can be opened independently for everyday use without operating the entire system.
Glazing
The glass used in the door panels, which can be double or triple glazed for improved insulation.
Powder coating
A dry finishing process that creates a durable, high-quality finish on aluminium frames.
Multi-point locking
A security feature where the door locks at multiple points along the frame when closed.
Here to help
We are adding to this section all the time – however, if you don't see the word or phrase in our handy glossary, then feel free to get in touch with our helpful team who will be happy to assist you.