Smoke leakage (S): Failure of the criterion shall have happened Should the flow level in duct A throughout the exam exceeds ten m³ / (m² h), linked to 20 °C and 1013 mbar, linked to the internal floor space with the duct inside the furnace. Entirely encapsulated in aluminium foil https://caswell-group02234.estate-blog.com/35624757/5-simple-techniques-for-fire-resistant-ductworth-isntallers