Circular fire dampers are installed in the flexible or massive fire wall between two ventilation ductwork where the ductwork crossed fire walls to prevent the propagation of fire.
Dampers are tested in accordance to EN 1366-2 and certified as EI120(ve i→o)S
⦰100 to ⦰800
for vertical supporting flexible or massive fire wall
⦰100 to ⦰630
for horizontal supporting massive fire floor or ceiling