I am looking for a sliding folding concertina door system to fold 8 x narrow doors , 4 each way. Doors are 2200 mm x 235 mm x 35 mm in size and weigh approx. 20 kg each. I will need a system which has both top and bottom tracks – 2100 mm in length.

The suitable gear for the sliding folding arrangement you describe for your doors would be the Coburn Foldaside 100, (see components listed on our web page at the link shown) a set to do all 8 doors on a 2.1m top & bottom track will have to be bought in component form, with two 4 door kits on one track set.