At about 1:17 I mention my treatment of wood. I usually split wood to arm size anyway and in the process separate the bark or outer sections to start the fire but put on heartwood during the rest of the smoke.
I don't always do this and sometimes throwing a big log on bark and all is fine. It depends on your smoker and fire... which is the pitmasters call.
NOTE: This was part A of a TEST of the BBQ Stoker Fan for endurance using a vulgar amount of wood to show the new 25 CFM blower would do the job. I do not pack my firebox like that.