Smoke leakage (S): Failure of this criterion shall have happened if the movement amount in duct A throughout the check exceeds ten m³ / (m² h), related to 20 °C and 1013 mbar, connected with the internal floor space with the duct In the furnace. Retrieved ten January 2020. Early https://fire-rated-ductworth89011.activosblog.com/35700508/fire-rated-ductworth-things-to-know-before-you-buy