A fire exit is designed to provide an easy escape route from a building and will always be an external door. It is usually fitted with some easy release exit hardware including a push bar and is does not necessarily provide protection from fire.
A fire door is designed to provide protection against the effects of fire for a length of time. This can vary from 30 minutes up to 240 minutes depending on the level of protection required. Fire Doors can be fitted internally and externally on a building to provide ongoing fire protection.