There is an approved document guidance available from the builders hardware industry federation bhif hardware for fire and escape doors.
Fire escape door signage.
Fire exit signs are not a requirement if it is obvious where the exit is for example when there is just one door at the front of a small shop where it is clear that would be the means of escape.
Signs undergo a stringent ink adhesion test to ensure they don t separate from the sign.
On the approach side of all doors leading to a fire escape or fire stair regardless of where in the building the door is located on both sides of all doors between individual fire compartments where the doors must be kept closed at all times.
Fire exit doors are the final door on an emergency exit route that must lead to a place of safety.
Fire exit signs should be fitted as close to the centre line of the escape root as possible for example above the door in the centre.
Issue 4 2012 detailing the requirements for any fixtures and fittings used with fire doors and fire.
Fire exit emergency.
Signs for all fire exit doors all states.