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- In accordance with DIN EN 15650- For installation in ventilation and air conditioning systems in buildings in any air direction in accordance with DIN 1946-6- For installation on, under the ceiling or in the wall - Hinge-free, non-corrosive, metallic adjustable lock by means of relaxation of two stainless steel double torsion springs- Free ventilation cross-section- No inspection opening required on the floors, Maintenance via camera inspection every 5 years- Fire resistance class in accordance with EN 13501-3- Solid ceiling EI 120 (ho i<-->o)-S (300 Pa)- Solid walls EI 90 (ve i<-->o)-S (300 Pa)- Drywall EI 90 (ve i<-->o)-S (300 Pa)- in accordance with DIN EN 1366-2- Not approved for Switzerland- As a precaution, type WFK fire dampers should not be installed in ventilation systems, which are subject to mandatory testing in accordance with the testing regulations of the federal state in which they are to be installed
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