I recently bought a Smoke Hollow electric (model 30166E) to tide me over until I finish my RF. It was on sale and seemed to be
built fairly well for the price. I noted that there was virtually no means for air flow. No air intake except for leakage around the door and a pencil sized hole at the top for exhaust vent. I have not had good luck with chip pans and good smoke. So I went to work on this brand new smoker installing a "mailbox" mod. I have made some very good jerky, pork butt and beef ribs so far. I use a AMNPS for smoke generation in the mailbox. I chose that model for the same reason others have stated, it can burn both pellets and dust. I have not used saw dust so I can't speak to how well it burns / smokes. But the pellets sure work good.....amazing.
I had some 3" exhaust pipe in the shop so that is what I used for both intake and exhaust. I made both openings adjustable so i could close them off and use the cabinet as originally intended. I am still learning where to set things, but I have been running the air intake wide open and then closing off the top stack by 60 to 80%. This is mainly to keep good temps during winter.
Good luck with your new unit. Take your time, learn from every smoke. Get yourself a notebook and note each and every cook, it will help you remember settings, do's and don'ts . BTW welcome to SMF!!