Smoke leakage (S): Failure of the criterion shall have occurred In case the move amount in duct A throughout the take a look at exceeds 10 m³ / (m² h), relevant to twenty °C and 1013 mbar, related to the internal surface area spot of your duct inside the furnace. https://fire-resistant-ductworth11233.ambien-blog.com/43115581/what-does-ductworth-installation-mean