you’re looking for a 6"- 4" reducer (or similar). Amazon will carry lots. the splitter will run one connection to the cooling tray and one to the bullet exhaust. Depending on your setup you may also want/need a blast gate (again amazon carry these too). You don’t mention if you have any filtration in the venting setup. This can help with reduction of coating/cleaning of your fan. hope this helps
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Definitely recommend a filter before the fan due to the oils in the smoke. It will help with the longevity of your fan.
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Love the mixing bowl!
There is lots of info and suggestions on the Bullet’s Facebook page (fan page I guess) with pictures and additional guides from avid and generous Bullet users. To give you a quit hint, you can use in-line duct fans; place it between two duct pipes (head-resistant materials), place one side near or connected to the exhaust cavity and lead the other one out of the room. Then you’re good to go. My last piece of advice is not to use the 3-printed exhaust piece. Instead, use an upside-down funnel 10 cm away from the exhaust to collect the fumes and smoke. The connected vent system to the Bullet can adversely affect the roast profile.