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I think any fan will get loud because the noise is generated by the air wooshing through the ducting and not the fan itself. i recommend a dimmer and a lot of acoustic foam. throw a muffler into your duct work and it should help a lot.
also, run a hepa filter, fish tank, noisy fan, radio, anything to generate some masking noise for extra protection.
i was also thinking you could put your computer in the same room as the grow and install a fan in the case on a controller and when youre not home, turn it up to an annoying level.