Attnang-Puchheim manufacturer building fire doors and gates around a proprietary emission-free mineral core, which is what lets it certify large closures at low weight per square metre. It holds 24 live VKF recognitions, and unusually two thirds of them are shutters — Brandschutztore (8) and Brandschutztore mit Verglasung (8) — alongside Brandschutztüren (4), glazed doorsets (2) and two Rauchschutzabschlüsse. Its own literature cites testing to EN 1634 without publishing numbers, so the VKF recognitions are the quotable evidence.