The fire dampers are designed for square air ducts with sizes 200x100 - 1200x900 mm.
The dampers are suitable for installation in all common building constructions, they can be installed in fire partition and rigid ceiling construction including installation of dampers in a group.
Activation of the damper in case of fire is ensured by a fusible link (WT72 or WT95), which activates the closing mechanism at temperatures higher than 72 °C or 95 °C, or by a 24 V or 230 V actuator.