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DIN EN 13501-3
Fire classification of construction products and building elements - Part 3: Classification using data from fire resistance tests on products and elements used in building service installations: fire resisting ventilation ducts and fire dampers and/or power, control and communication cables; German and English version prEN 13501-3:2023
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DIN EN 00156253
Ventilation for buildings - Metallic ventilation ducts - Requirements and test methods
