We are replacing a fire door to a plant room at the top of a stair well. We believe the door is a 30 minute fire rated door with vision panel in. The client has asked to confirm what fire rated door is required and if a vision panel is required.

I would also like to know what fire rated door is required for a plant room. We are adding an extra level to our home, and this room will be at the top of a stairwell. It sounds like you are in a very similar situation. I don't want to buy something that is not up to regulation.

It is most likely to be a FD30s fire door and if a fire alarm is installed, then a vision panel would not be necessary. But you need to check it out with the fire risk assessment and the FR assessor who should be able to you a definitive response.