= 25 dB(A) H461Limit for industrial worknoise at night within Germany according to VDI-Richtlinie 2058 (H460Association of German Engineers guideline) and TA Lärm (technical regulation about noise) according to § 48 of Bundesimissionsschutzgesetzes (BImSchG) (German Federal Imission Protection Law).
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The product data sheet gives you detailed information about the fan.