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Festning (Oslo, Norway)
3 lanes, 1.800 meters long tunnel in Oslo, Norway. CTA started installation in 1989 and ended in 1990. Shaft installation, total air cleaning volume 600 m3/s.
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Granfoss (Oslo, Norway)
3 lanes, 2.340 meters long tunnel in Oslo, Norway. Installation started in 1991 and ended in 1992. Bypass installation with a total air cleaning volume of 200 m3/s.
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Elbe Tunnel (Hamburg, Germany)
5 lanes tunnel. CTA installed a pilot plant in the Elbe Tunnel, Hamburg, Germany. Installation started and was completed in 1994.
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Hell Tunnel I/II/III(Trondheim, Norway)
2 lanes, 3.900 meters long tunnel in Trondheim, Norway. Installation started and completed in 1995. Ceiling mounted installation with a total air cleaning volume of 95 m3/s.
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Nygårdtunnel (Bergen, Norway)
2 lanes, 900 meters long tunnel in Bergen, Norway. Installation started in 1998 and finished in 1999. Ceiling mounted installation with a total air cleaning volume of 250 m3/s.
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Chinbu Tunnel (South Korea)
2 lanes, 2.800 meters long tunnel in Chinbu, South Korea. Installation started in 1998 and finished in 1999. Bypass installation with a total air cleaning volume of 285 m3/s.
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Strømsås Tunnel (Drammen, Norway)
2 lanes, 3.600 meters long tunnel in Drammen, Norway. Installation started in 2000 and completed in 2001. Ceiling mounted installation, 4 stations, with a total of air cleaning volume of 160 m3/s.
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Lærdal Tunnel (Sogn og Fjordane, Norway)
Lærdalstunnelen, with two lanes, is the longest rock tunnel in the world. Installation of the CTA EPS started in 2000 and was finished in 2001. This was a bypass installation with a total of air cleaning volume of 180 m3/s.
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M30 Madrid Calle 30 Project, Madrid, Spain
The Madrid M30 motorway, the inner ring road of the city, is at the centre of a major urban renewal project. CTA is contracted to deliver both the gas cleaning and the EPS filters for the south part of the M30 Madrid Calle 30 project. There are two stations, one is 694m3/2, which is the biggest in the world, and the second one is 400cms.
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Ekeberg I/II (Oslo, Norway)
Two 2-lane tunnels, each 1.400 meters located in Oslo, Norway. Installation started in 1993 and finished in 1995. Bypass installation with a total air cleaning volume of 500 m3/s.
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Trunk Road T2
A dual two-lane,3100 meters long tunnel in Hongkong.Total air cleaning volume is 230 m3/s.
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Central Kowloon Route
A dual three-lane carriageway with a total length of about 4700m. The largest APS project in the world.9 APS, total air cleaning volume of 2250 m3/s.