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based on BS EN 1751:1999; The leakage class determines the acceptable air leakage through the damper with a 100 Pa pressure difference. class 0 - No requirements; class 1 - less than 0.2 m 3 /s per m 2 valve area; class 2 - less than 0.04 m 3 /s per m 2 valve area; class 3 - less than 0.008 m 3 /s per m 2 valve area; class 4 - less than 0.0015 ...
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