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What Is The EN Power Size of a Fire Door Closer?

Small and light fire doors require less strength from a fire door closer to shut properly in comparison to large and heavy fire doors. When selecting a fire door closer for your fire door you need to find out which door closer has enough closing strength/closing force for your specific door. To make this process easier, door closers have been grouped into different strength categories, called "EN power sizes". Below is the table that shows for each power size how heavy or wide the fire door can be to be safely shut.

If width and weight do not call for the same power size, select the higher power size as the specification needed for your door closer.

Please note: power size EN3 is the minimum required for fire doors that must be fitted with an automatic door closer; EN1 and EN2 are not actually suitable for use on fire doors in accordance with EN 1154.

EN Closing Force Category Maximum Door Width Maximum Door Weight
EN 1 750mm 20kg
EN 2 850mm 40kg
EN 3 950mm 60kg
EN 4 1100mm 80kg
EN 5 1250mm 100kg
EN 6 1400mm 120kg
EN 7 1600mm 160kg
FAQs

FAQs (3)

What are closing force ratings for fire door closers?

The closing force rating of fire door closers, also called "power size", relates to the maximum width and weight of fire doors that the door closer can reliably close and hold closed.

What is the minimum power size for a door closer fitted to a fire door?

Power Size EN 3 is the minimum closer strength required for any fire doors that must be fitted with an automatic closing device, as per recommendations in BS EN 1154.

EN 1 and EN 2 are defined in the Standard, but are only recommended for use on non-fire doors and are not actually suitable for use on fire doors. This is because fire door leaves are denser and heavier than non-fire doors, they are fitted with seals around the door edges which may cause resistance when closing, and it is critical that they are fully closed to prevent the spread of fire and smoke. Fire door closers therefore need to apply more force to fully close the door.

BS EN 1154 is the harmonised British-European Standard which covers performance and test methodology for door-closing devices, not limited to those intended for use on fire doors. EN Power Sizes are a classification system for door closers, where each power size corresponds to a range of door widths and weights that the closer is suitable for to ensure the door is fully closed. They range from EN 1 (maximum door leaf width of 750mm and weight of 20kg) to EN 7 (maximum width of 1600mm and weight of 160kg). Power Size EN 3 supports doors up to 950mm wide and weighing up to 60kg.

How do you stop fire doors slamming shut?

To stop your fire door from slamming shut you will need to adjust the closing speed or check the power size of the fire door closer fitted to the fire door. Regulations state that fire doors should self-close completely and reliably. They do not however need to bang or slam shut.

Many self-closing devices can be adjusted so that the door will close correctly without slamming. Other issues including a loss of fluid or improper fitting could be causing the issue. It is also possible to fit self-closing devices with a latching action which close the door quickly at first and then stop it from slamming by closing the last few inches slowly. It is advisable to have your fire door closer maintained and adjusted by a competent person.