Slim-line Bi-Folding Doors
intro line

Frequently Asked Questions

Q: What is the minimum & maximum width per bifold door leaf?
Minimum 550mm and maximum 1100mm per door leaf.
Q: What is the maximum height of the bifold door system?
The maximum height including, the frames are 3000mm.
Q: What colour options do you offer?
You may choose from the full range of RAL colours.
Q: Do you do colour code hardware & seals?
All system hardware and seals can be colour coded.
Q: Are the bifold doors top or bottom hung?
The doors run on a bottom track (bottom hung).
Q: What threshold options are there?
We offer standard weather rated threshold only as standard of which is recommended for external use and comes with a severe weather rating.
Q: Is the bifold door system running gear visible?
The running gear is concealed with the bottom track and is not visible.
Q: What Type Of Glass Is Supplied?
On our doors the glass is either Pilkington or Saint-Gobain Soft Coat – Clear – This is Low ‘E’ but has no solar control (not recommended for full sun facing units). The upgrades available are Saint-Gobain Planitherm or Pilkington Activ Neutral and Activ Blue. These are self-cleaning glass units with solar control. For more FAQ’s glass information, please click here
Q: Where was your bi-fold door system designed?
The Ultra Slim bifold doors are manufactured and designed in the West Midlands UK.
Q: What guarantee do your bi-fold doors come with?

The Ultra Slim bifold door system and frames come with a 10 year manufacturer’s guarantee and the glass sealed units 5 years manufacturers guarantee, subject to the compliance of the 4 Season Doors & Rooflights Ltd terms and conditions.