Not sure how many folks are thinking about getting a cold smoke generator or maybe replacing an existing one that is past it's prime but found a comparison between Bella and Smoke Daddy on YouTube. It appears that a SI #4 is the smoker. Enjoy!
https://www.youtube.com/watch?v=os7XsxWUiqI
https://www.youtube.com/watch?v=os7XsxWUiqI