Maxim MB31 Combination Acoustically Packed Chamber Blower, Expected Attenuation is 25 to 30 dBA, to download spec page click here
The MB31 provides the highest degree of overall noise attenuation on blower intakes or discharges. Use an MB31 where background noise is extremely low and the best degree of silencing is required.
Typical Applications: Rotary positive blower intake and discharge
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