Fire Doors on uneven floors

[wainy]

Hi All
Does anybody have a solution for fitting a self closing fire rated door, where the floor level rises appropriately 20mm within the swing of the door?
The use of an overhead closer in addition to rising butt hinges would solve the problem, I have been unable to find a door closer which will accommodate the change in height, if anybody knows of such a device I would be grateful

[Davo]

wainey

Rising butt hinges are not permitted on fire doors.

What about a rising brush seal at the bottom?

Try Envirograph

davo