ᐅ Which door stopper is suitable for a boiler room?

Hello,

A few months ago, I had new interior doors installed, and today the chimney sweep visited. He said that I need to have a ventilation grille installed in the door to the heating room or have a removable door stopper installed at the height of the lock.

Can anyone tell me what kind of door stopper this is, how much it costs, and what it looks like?

Thanks!

It sounds like the door, when open, is blocking the necessary air circulation.
If that is the case, attaching any object (a doorstop, a sawed-off table leg, or a wooden block) to the door should be enough, as long as the required distance to the heating unit is maintained when the door is open by the stopper.
If this concerns fire safety, and the door must not come too close to the heater when open, the doorstop must, of course, be made of non-combustible material if it extends into the “at-risk area.”
You should ask again about the purpose of this measure.

It is probably about the ventilation (however, there are also two windows in the room that can be opened). I will still receive the report.