A RECENT leading article in the British Medical Journal (1961) has stated that 'old age will provide the hospital service with its principal challenge in the next 20 years'. There is good reason for believing that this challenge is already in existence and furthermore that it concerns not only the hospital service, but the health and welfare services in the whole country. Much has been said and...

Stair pressurization systems are designed to create a smoke-proof barrier, preventing the ingress of smoke into staircases within buildings. In tall buildings over 25 m, evacuation strategies can utilize phased or simultaneous evaluation multiple storeys. This paper examines performance stair with differing number doors open starting from two doors, an incremental step up total 10 shaft. Simula...