Ventilation firm at Affoltern am Albis holding two live VKF recognitions in Untergruppe 801 Entrauchungsleitungen, 26874 and 26875. Together with Air-Ventil it is one of just two Swiss-owned holders of smoke-extract duct approvals in the whole register; the remaining 801 approvals sit with Promat, Lindab, Knauf Insulation, PAROC, GEOSTAFF and Mineralka.