Hey, I have a concrete garage so I started out venting into a 5 gal button full of water with a lid and vent holes. I am working on an exhaust system in my garage that goes through the ceiling to outside, but that's still very early. One thing I want to note now I've had the unit for several months, is some of the unit's parts are not solvent resistant. That caused the orings that hold the water curtain to fail, causing it to drop on a bunch of parts I was printing which was a nightmare. The LED bar connector also broke due to solvents breaking the plastic down. The company, OPHIR, has been responsive and sent me replacements at no cost, but I did also buy the Robot Kai Innovation X, although it has not arrived yet. I'll likely give my old one away in a contest. Overall I would still recommend the unit, just keep this in mind to control your lacquer/solvents.

Video on how to vent these units, kzfaq.infon1N8OyRlQfA?si=FmjGt1bGcPDLUQ-p

I just posted a short on how to vent these type of units. To sum it up, you can go the budget way and vent into a 5 gal bucket full of water. You will need to cut a 4 inch Circular hole and install a port and add vent holes to the 5 gal lid. The better way, is to buy something like a can-lite filter, or any similar virgin activated carbon exhaust filters. They are basically intakes full of activated carbon and that will clean 98% of VOCs and fumes. Amazon has some cheaper types of carbon exhausts, you just want to make sure it has at least a few pounds of carbon. (check weight on Amazon of item) This is the one I got since I now use the upgraded kaizo water curtain which has a 6 inch duct instead of 4 inch, but they have both on this page. amzn.to/45w3vUj You may still need to use the 6 inch because you may need at least 300cfm for either water curtain fan. Also the 6 inch one has 18 pounds of carbon, vs like 4 pounds in the 4 inch one

Here is the yt short that shows both set ups, kzfaq.infon1N8OyRlQfA?si=FmjGt1bGcPDLUQ-p

New assembly & review video published here, includes a few sections on venting the unit - kzfaq.info/get/bejne/eauPmJmo0tmxaKM.html