Application: Type: S-FSD models are symmetric dampers for installation in walls in fire zones and have fire resistance rating of 120/90/60/45/30 minutes (EI).
Application: Type: S-MFSD models are symmetric dampers for installation in walls of the two fire zones and have fire resistance rating of 120/90/60/45/30 minutes (EI).
Application: Type: S-FSD models are symmetric dampers for installation in walls in fire zones and have fire resistance rating of 120/90/60/45/30 minutes (EI).