hmm - I'm v. confused. Bought our 3-bed semi with converted loft & dormer & self-closing fire door. My local building control say that the function of the door is to protect an occupant from a fire elsewhere in the house. However, I wondered if it might also be to reduce the updraught experienced when the door is open, which is presumably a fire hazard.

The reason I ask is I thought about installing a vent above the door as the ventilation in the conversion is very poor (unless there's a strong south-westerly) - building control say no, not without an automatic fire detection system. The room is mainly for guests, so now I'm thinking, on the balance of probabilities (likelihood of a fire whilst room occupied by heavy sleeper vs need to ventilate).... leave the door open - got to be the best green option ???