Smoke leakage (S): Failure of the criterion shall have happened In case the circulation charge in duct A throughout the test exceeds ten m³ / (m² h), connected with 20 °C and 1013 mbar, related to The inner floor location of the duct In the furnace. Based upon points, either https://elliotnetgu.humor-blog.com/35656966/fire-rated-ductworth-fundamentals-explained