Hi Jason!
I don't have the Duo, but I do have a Char Griller Pro.
These units are not designed to use logs or sticks. You would be better off with "lump charcoal" and knuckle sized chunks of wood.
The dryer vent deal is to keep the smoke from going to the top of the unit without properly smoking the meat. On the new CG units the chimney is flared inside the pit, so you may have to deal with that in order to extend the chimney down to the grate.
Good luck and good smoking.
I don't have the Duo, but I do have a Char Griller Pro.
These units are not designed to use logs or sticks. You would be better off with "lump charcoal" and knuckle sized chunks of wood.
The dryer vent deal is to keep the smoke from going to the top of the unit without properly smoking the meat. On the new CG units the chimney is flared inside the pit, so you may have to deal with that in order to extend the chimney down to the grate.
Good luck and good smoking.