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If you're on the fence about building or buying a 3d printer enclosure, please let me give you a push.
(sh.itjust.works)
I should have built this thing from the word go. I ran this printer for almost a year on my desk right next to my computer. But it was loud and smelly and the high traffic area played havoc on print quality and caused a lot of warping.
Now that it's tucked away in a back room suspended in a corner by French cleats and sitting directly on top of dense foam and a big ass paver it is merely "audible" but certainly ignorable. There's also no more headaches from the smell, and my print quality has never been better.
Do yourself and your printer a favor and get an enclosure sorted out asap.
Mine will be on an exterior wall, so venting is an absolute possibility. With that though, I'm unsure how much air to move... my printer is enclosed, so drafts and warping aren't as big a concern; just VOC dispersal and safety. I don't need to catch a lung full of stage four because I wanted to print some junk to make gardening easier.
It's more about pressure than airflow. You just need negative pressure inside the chamber, so gas escapes into your chamber through the cracks, and out the vent.
I totally get that, if you are worried about over or under ventilating I'd just figure out how what the total volume of your enclosure is and then compare that to the CFM of your exhaust fan and it will give you an idea of how many air changes you get in a minute.