On Friday, August 25, 2017 at 4:26:59 AM UTC-7, DerbyDad03 wrote:
I have a 8 gallon wet-dry vac that I want to put inside a cabinet

Don't. Consider, instead, putting the noisy bit outdoors and plumbing
the intake through a wall. Or just putting it in an
adjacent room. A cabinet will just take up space, make the vacuum
into a bulky fixture, and waste building materials, compared
to (for instance) wearing earplugs.