I bought a Delta Breez for about $60. 80cfm, uses only about 12 watts, rated for continuous use, 0.8 sones. You can hear it but most of the noise you hear is the air it is moving. Uses 4" duct. There are higher capacity and quieter fans but if you want either you need to go 6" duct or you'll be burning more energy and making more noise.
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