Amstetten manufacturer trading as Thermax, holding 10 live VKF recognitions across the services-protection families: Lüftungskanäle und -bekleidungen (3), Platten (3), Entrauchungsleitungen (2), a Brandschutzkanal Tragsystem and a certified construction system. Fire-rated ducting is a discipline of its own — the duct has to keep its shape and its seal while carrying hot gas out of a burning compartment — and this is Austria’s holder in it. The Entrauchungsleitungen approvals also give it a smoke-management key.