In our granite office building on the first floor there are glass slats located above the door, they can be opened and closed above both the kitchenette and comms room, I assume with the age of the building these were originally for light and ventilation with them being internal rooms, should these slats be removed and blocked. There is only a microwave, toaster and kettle in the kitchen, no cooking appliances and the comms room has the servers with an air con unit.

It depends on where these rooms are located in relation to escape routes - unless they open onto a stair it's quite possible that they are OK as they are and it would only be a non statutory property protection consideration to increase the fire resistance.