The main functions of a compliant Fire door is to reduce the spread of fire between rooms and to protect escape routes providing a means of escape.
Fire doors should be inspected every 6 to 12 months.
Here are some of the things to lookout for
. Door not closing
. Damaged doors
. Leaking hinges
. Damage/missing intumescent seals
. Gaps around the door shouldn't exceed 3 - 4mm