How Do I Know My Fire Doors Are Installed Correctly?
![fire door authorised plug insert](https://fire-door-installers.co.uk/wp-content/uploads/2021/12/fire-door-authorised-plug.jpg)
Open the door, look at the inside of the door, the surface that touches the wall when the door is closed. Near the hinge, you should find a label and a little round yellow or blue plug with a tree shape metal insert. The metal tree will have an embossed three character number on it. […]