Fabric faced products offer noise levels at least 10NC quieter than metal.

The combination of perforated panels and louvers in common metal diffusers for critical environments result in significantly higher sound power ratings (NC) than observed results for fabric faced D-Fuser products. The chart reveals NC levels for an industry standard metal diffuser and a D-Fuser at varying air volumes (500cfm, 750cfm and 1000cfm).

 

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