Danish ventilation manufacturer holding the only smoke-duct certificates in the Danish CPR register: 2531-CPR-CVC10004 for its circular and CVC10005 for its rectangular Røgkanalsystem, both under EN 12101-7:2011 and issued by DBI Certification, notified body 2531. EN 12101-7 covers the duct sections a powered smoke-extract system depends on — the part that has to stay intact and leak-tight while carrying fire gases out of a compartment. Across the whole 883-certificate register only three certificates sit in the EN 12101 family, and Ø LAND holds two of them; the third is Swedish.