Jet fan
A jet fan (also jet blower or jet fan ) is used to ventilate tunnels , underpasses and multi-storey car parks / underground car parks by amplifying a natural draft or a draft generated by vehicles passing through. Jet fans have been used in Europe since the early 1960s.
Layout and function
A jet fan essentially consists of an elongated tube with an electrically driven fan working in the middle . The expelled air flow entrains the surrounding air in the tunnel cross section and thus ensures a movement of the entire air column in a tunnel tube. Often the fans can be reversed in their flow direction in order to be able to correspond to a changing direction of travel or a natural draft. Usually several jet fans are used next to each other and at regular intervals in order to be able to guarantee the required air exchange rate. The inlet and outlet tubes are designed as silencers .
swell
- U. Meidinger: Longitudinal ventilation of car tunnels with jet fans , Schweizerische Bauzeitung, Volume 82, Issue 28, July 9, 1964, p. 498 ff. Online (accessed on March 23, 2011; PDF; 1.3 MB)