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Do I need an IFW-kit when installing the CU-LT at minimal distances in a light wall (metal studs)?
No. For minimal distances in a lightweight wall, hard batt or stone wool is used for the sealing of the opening on the side with minimal distances. The other seals can be carried out in accordance with the existing solutions. Detailed information for each wall/sealing combination can be found in the relevant installation methods: Optimised rectangular fire damper up to 120°.