KTB-O Round fire damper with divided blade
Depending on the installation method KTB-O dampers have a fire resistance class of EI 120 (ve i←o) S, EI 90 (ve i↔o) S and EI 60 (ve i↔o) S and can be installed in the following construction partitions:
- rigid walls with a thickness of 120 mm or greater and a fire resistance class of EI120 or higher (e.g., concrete walls, solid brick walls, walls made of aerated concrete blocks or hollow blocks, and panels),
- rigid walls with a thickness of 100 mm or greater and a fire resistance class of EI90 or higher (e.g., concrete walls, solid brick walls, walls made of aerated concrete blocks or hollow blocks, and panels),
- flexible walls with a thickness of 100 mm or greater and a fire resistance class of EI 90 or higher (thicker, denser, multi-layer panels).
What sets the KTB-O round fire damper with divided blade apart from other round dampers in our range is the fast installation inside a ventilation duct embedded in the wall. Another key feature is the divided blade of the damper, which opens in a single direction, allowing installation within the thickness of the wall – enabling the potential installation of a grille.
The KTB-O damper is most commonly used to ensure the appropriate fire resistance class of shaft walls, such as in apartments in multi-family buildings. It can be used in both supply and exhaust installations, as well as in natural and mechanical ventilation systems.
In standard, the KTB-O damper housing is powder-coated in RAL 9010 color.
Are you considering the KTB-O fire damper for your design? Contact us for free design advice.
We manufacture KTB-O dampers in diameters typical for round ventilation systems: 100, 125, 150, 160, and 200 mm. The damper housing is reduced in size to allow it to be inserted into the pipe. The damper is equipped with an external gasket, ensuring high sealing performance and securing the damper in the duct.
Yes. The KTB-O damper can be easily removed from the duct and reinstalled afterward.
Yes. Simply open the KTB-O damper, install the thermal trigger, and insert the damper into the duct. The EI60S fire-resistant transition is ready!
KTB-O dampers are available only in the KTB-O-S variant. This is a fire damper for ventilation ducts (normally open), equipped with a fusible link and a return spring, which stores energy when opening the partition and uses it to close the partition afterward. The partition remains in the open position due to a thermal trigger with a nominal activation temperature of 72°C, mounted in clamps located on the partition.
Additionally, KTB-O dampers can be equipped with a limit switch that indicates the closed position of the partition.
