Dierre manufactures fire doorsets alongside armoured, internal and garage doors at Villanova d’Asti in Piemonte. Its fire-door range is tested for fire resistance to EN 1634-1 and classified to EN 13501-2 at EI2 30, 60, 90 and 120, and the doorsets are CE marked under the product standards EN 13241 and EN 16034 — the fire and smoke resisting route rather than EN 14351-1 alone. The group separately publishes ISO 9001, ISO 14001 and ISO 45001 certificates, which are management systems and are not the basis for its listing here. Dierre does not publish the notified body number or individual certificate numbers on its public site.