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I have to deliver an HVAC system with air-tightness class ATC 3 (formerly C) or D. Is there any Rf-t fire damper that guarantees that class?
Yes, Rf-t fire dampers are available in air-tightness class ATC 3 (formerly C) according to EN1751, which corresponds to the classes C and D for the ducts. Particular attention should also be paid to the air-tight assembly of the damper with the duct.