Hi Seven welcome to the thread.
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How did I manage to keep the box so quiet?
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1 It is insulated. (It will have even more insulation after I do some modification.)
2 I bought an exhaust fan that is very overrated (CFM wise) for the box cubic feet size (which is 24 cubic feet) and am running it at low RPM. The exhaust fan is so quiet you don't hear it sitting right next to it. If you look at the picture titled "Support Equipment" early on in the thread you will see the fan in the background (it is blue). It is mounted using duct straps that have pipe insulation wrapped around them. No vibration at all.
In general careful enginnering keeps vibration down.
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and how do you control the odor?
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I don't control odor, I vent it outside where it isn't noticed. I do check outside periodically for both odor and possible light leaks. Remember to be ever vigilant in the protection of your freedom. Should odor ever become a problem I can easily retrofit a carbon filter to my exhaust system.
Hope that helps.
Stay tuned for the finish of the grow and the post grow modifications.