Ive just taken over as the govener for H&S at my kids playschool. its a small single story building comprising of 3 linked rooms with a fire exit at either end. Both fire exits are locked the an old style mortise lock (the large key type) which is hung up on a nail on the back of the door in question. Also there is a security chain at high level fitted to the door to stop any escaping kids (The kind fitted to flats) is this acceptable? or should it have a single means of exit such as a strike bar? however the door also opens inwards.