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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 Bifold and Sliding Doors, here on in known as Bristol Bifold - which are both trading names of Crystal Clear Bristol Ltd, 24 Emery Road, Brislington, Bristol, BS4 5PF (Company number 03874720) :: Tel: 01179 717 880 :: Web design by ProfitReach - About this website