Does a fire door need a door closer?
Get a priceAlmost always, yes.
A fire door only works when it is shut. Nobody shuts a door in an emergency, so the door has to do it by itself.
Flat entrance doors and doors on communal escape routes should have a self-closing device. That usually means a closer on the door and a latch that catches when it arrives.

How a closer goes wrong
The arm works loose from its fixing.
The closer is set too weak, so the door stops short of the latch.
It has been taken off because it was noisy. That happens more often than you would think.
It has been replaced with a different type that is not suited to the door.
A door held open
Some doors are meant to be open all day. They are held by a magnetic or electric release wired to the alarm. When the alarm goes, the release lets go and the closer shuts the door.
A wedge, a chair or a hook is not the same thing. It stops the door closing at all.
A quick test
Open the door about halfway and let go. Then open it wide and let go. If it shuts and latches both times without help, the closer is doing its job.
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