HI 

we have an issue on a project, we have installed sets of fd60s double door sets and had 4mm gaps all round however these sets have combined intumescent and cold smoke strips. the doors would not close tight to the frame catching on the cold smoke strips and damaging them ie ripping these, so we made adjustments and made the gaps where the 2 doors meet only ( 5mm ) some ( 4.5mm ) to prevent damaging the cold smoke strips, and to ensure the doors closed tightly into the frame. I see an article online which states this is acceptable however there is information online which contradicts this, please see the article below I refer to and see and have highlighted. Would ideally like some other professional opinions on this please as im torn on what's best to do on this one. thanks in advance

 

 

 

You are best asking the manufacturer who will provide maximum tolerances for their doorset to retain performance.