By the sounding of the fire alarm.
Fire escape door size.
A good fire escape plan should therefore be clearly visible with legible lettering and the fire escape route made.
A stair is the clear width between the walls or balustrades.
A door or doorway is the clear width when the door is open see diagram c1.
It is important that each floor plan of a building indicates the shortest route s to a place of comparative or ultimate safety should an emergency evacuation be triggered e g.
An escape route is the width at 1 500 mm above floor level when defined by walls or elsewhere the minimum width of passage available between any fixed obstructions.
Common options are 2040 x 526 626 726 826 926 x 40mm.
There is an approved document guidance available from the builders hardware industry federation bhif hardware for fire and escape doors.
Issue 4 2012 detailing the requirements for any fixtures and fittings used with fire doors and fire.
Section 1910 155 c 3 iv a of this part defines listed and 1910 7 of this part defines a nationally recognized testing laboratory.
The width of final exit doors and the escape routes leading to them will dictate the maximum number of people who can safely occupy.
Each fire door including its frame and hardware must be listed or approved by a nationally recognized testing laboratory.
A fire escape plan is for use by the public and occupants in case of a fire as well as for the fire fighters.
The main difference between these and the standard uk sizes above are an increased door height of 2040mm and door thickness of 40mm.