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frequencies (Hz) 125 250 500 1000 2000 4000 aw Class NRC
blades 133 mm open 0.13 0.15 0.22 0.21 0.27 0.43 0.25 D (H) 0.25
blades 133 mm closed 0.02 0.08 0.18 0.31 0.27 0.41 0.30 D 0.20
                   

Acoustic report available on request.

The acoustic results are similar when the blinds are either open or closed.
 
 
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