Smoke leakage (S): Failure of this criterion shall have occurred In case the stream amount in duct A during the test exceeds ten m³ / (m² h), relevant to twenty °C and 1013 mbar, related to the internal area area of the duct In the furnace. has contacted for remark, https://fireratedductworth90011.buyoutblog.com/36745769/fire-rated-ductworth-an-overview