Starting a new thread for this so it doesn’t get buried deep in my conversation with @billc 
I had a good setup for chaff collection from the cooling tray with the exhaust adapter and mesh bag but my wife wasn’t stoked on the chaff that I indiscriminately blew out of the roof vent into our backyard lol so I’ve been on the recent quest to keep things cleaner and more chaff free.
My build is based on @billc cart thread. I’m on my third version of arrangement and this one is the best so far but I’m still having issues with the last bit of chaff being blown out of the Bullet exhause during cooling.
Suction and airflow from my 4" Vivosun inline blower is sufficient during the entire roast to collect chaff and send the smoke up the chimney to the outside world. My challenge is when cooling begins. I assumed that between the inline fan, the cooling tray fan, and the increased speed of the exhaust fan they would together provide more than enough airflow to send all the smoke and chaff through the system. My assumption was wrong. It’s almost like there’s backflow happening during cooling from the Bullet exhaust and so there’s a small puff of initial smoke, and a small amount of chaff escaping during cooling.
I’d love any insights or advice from folks who have solved this issue before! Thanks!
