FREE GUIDE: "7 Secrets Other Bifold Door Suppliers Won't Tell You"

Get Free Guide

What is a Sliding Mullion on a Bifold Door?

A sliding mullion is only used on an even number of doors which all fold/slide in the same direction, e.g. a 2 door set or 4 door set. A sliding mullion is not required when the even number of doors are split, e.g. a 4 door set where 1x door goes to the left and 3x doors go to the right.

A sliding mullion is not beneficial but a necessity. It's best avoided if possible as it will increase the sight lines, essentially it is required to prevent the door trolleys/guides from fouling on the jambs (side frames) when the doors are closed.

You can see a sliding/floating mullion in the video here:


Download the FREE 7 Secrets Other Bi-fold Door Suppliers Won't Tell You

The FREE 7 Secrets Other Bifold Door Suppliers Won't Tell You

Download FREE eBook Now!

When searching for a bi-fold door, suppliers won't always give you all the information you need - that's why we've provided you with this FREE eBook. Don't miss out, click here to download it now.

Supplying and Installing Bi-fold Doors & Sliding Doors to the South West & Wales

Privacy Policy

Name & Registered Office: Bristol Bi-fold and Sliding Doors Limited, Old Green Farm, Earthcott Green, Alveston, Bristol, South Gloucestershire, United Kingdom, BS35 3TD. Company Number: 06922945. VAT Registration Number: 978658538. Web design by Blazen Web Marketing - About this website