Smoke leakage (S): Failure of the criterion shall have transpired In the event the movement rate in duct A in the take a look at exceeds 10 m³ / (m² h), associated with twenty °C and 1013 mbar, relevant to The interior surface place in the duct inside the furnace. https://spencerzrfth.myparisblog.com/37532113/fire-rated-ductworth-fundamentals-explained