Neilsee

I have been asked to fit an intumescent seal to an existing front door which is deemed to be FD30. As it is a tight fitting door I want to router a channel in the door and fit a flush seal. However there will be a gap where the seal meets the door furniture of a lock and catch - probably 180mm long on the opening side of the door. Is this acceptable as there will be no seal over this length of the door?Thanks