EI120: This product can endure high heat for 120 minutes, over 120 minutes the integrity and insulation properties will gradually decrease. (For smoke pipes and channels located outside the range of the combustion chamber that the system serves)

EI 60 Fire-rated ductwork is a type of duct with a fireproof shell structure to withstand fire in a high-temperature environment for up to 60 minutes.

EI 45 fireproof duct is a type of duct with a fireproof shell structure to withstand fire in a high-temperature environment for up to 45 minutes.

Fire-rated ductwork EI 30 is like any other ductwork. There is Fire-rated ductwork 30 made from a 0.75mm thick galvanized sheet. Fireproof panel with a panel thickness of 14mm.