Underground traffic system used as tunnel comprises air suction system for conveying air from car park and having air line containing smoke detector with smoke-permeable dust protection filter formed as magnetic filter

摘要

An underground traffic system comprises an air suction system (4) for conveying air from a car park and having an air line (6) containing a smoke detector (7) with a smoke-permeable dust protection filter formed as a magnetic filter (8). An independent claim is also included for a smoke detector used in the above air suction system.