So I finally got around to taking a video of my GF and recording the sound levels with an external sound meter. Take a look here https://youtu.be/6GvFb8Tr-Hk
Basics are as follows
gf idle: 45db
harbor freight exhaust: 71db
gf during cut: 71db
gf and exhaust during cut: 75db
I fixed up my exhaust fan after the video and got rid of the rattle and it is now down to 62db with just the exhaust.
The sound meter app is free, so you can check your own work space and make sure you are below the 85db threshold where OSHA regulations would kick in for a safe work environment.
I’d be interested if other people get similar readings. I’m curious how much the environment around the machine impacts the sound. I have my setup backed up to a brick wall. I’m sure if it was dry wall or more open space the sound would be lower. I may put some acoustic panels behind to deaden the sound a bit.