CE marked maintenance-free FK 90K fire dampers are compatible with the European Product Standard EN 15650. Series FK92K includes fire resistant dampers for 30, 60 and 90 minutes. Various installation choices of FK90K fire dampers provide planning flexibility for the users. The shut-off damper blades can be in the horizontal or vertical position when they are installed. They can be provided in the different sizes from 100 mm x 100 mm to 800 x 250 mm (WXH). FK 90K fire dampers are suitable for tight installation conditions in particular due to their specific sizes. The damper casing has class C air leak tightness according to EN 1751. Also, the replaceable damper blades are made up of wear-resistant and corrosion-proof calcium silicate. Further parts are made up of galvanized steel and optionally they can be supplied with epoxy powder coating. The activation temperature for enclosed release elements is 70 °C or 95°C. The actuators are operated manually or automatically with electricity. FK 90K Fire Dampers have an Environmental Product Declaration (EPD). They have been awarded with the hygiene certificate as well.