Effretikon air-conditioning manufacturer holding four live VKF recognitions in Untergruppe 504 Brandschutzklappen — 27093, 27094, 27095 and one further approval in the same block. Its whole VKF holding is fire dampers, which makes it one of the very few Swiss-owned damper holders in a family otherwise dominated by German, Belgian and Scandinavian groups. ⚠ its site is served over HTTP only.