Passive fire protection systems include fire-resistant walls, fire doors and heat resistant glass windows. Firewalls can ‘compartmentalise’ the fire from 30mins up to four hours, allowing time for people to evacuate the building and for the fire services to arrive. It can also protect other parts of the building, adjacent premises (boundary walls) or next-door neighbours (party walls) but because it does not stop the fire it’s a passive protection system.