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For extremely low-leakage shut-off in ventilation and ait conditioning systems. Rectangular multileaf dampers for volume flow and pressure control as well as for extremely low-leakage shut-off of ducts and openings in walls and ceiling slabs. For more information see: https://www.trox.de/en/multileaf-dampers/jz-ll-80fda7f25593a280 Rectangular multileaf dampers for volume flow and pressure control as well as for low-leakage shut-off of ducts and openings in walls and ceiling slabs. Ready-to-operate unit which consists of the casing, aerofoil blades and the blade mechanism. Flanges on both sides, suitable for duct connection. The blade position is indicated externally by a notch in the blade shaft extension. Closed multileaf damper air leakage to EN 1751, class 4 (B = 600 mm, class 3). Casing air leakage to EN 1751, class C. This EPD includes the environmental data of the product series JZ-LL. The following represents a specific dataset of the most sold variant in the declared sales year (JZ-LL-G-M-R/350x250/Z51).