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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:

 

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

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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