How to tell if a door is a fire door?

What am I looking for to make certain it is a fire door?

Asked by Monika Lydia on 17th Sep 2025
Expert Trade Answers
"If the door is 44mm thick then you pretty much certain its a 30min firedoor
Also some fire doors have a round plastic plug in one of the edges denotes whether its a 1 hour or 30 min firedoor"
Answered on 17th Sep 2025 - Member since Jan 2018 - report
"Hi Lydia,

So either the door or door linings should have intumescent strips around the whole perimeter of the door/door frame.

Other indicators -

Signs/labels
Hardwood door
Intumescent strips"
Answered on 17th Sep 2025 - Member since Sep 2025 - report
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