So after reading this exhausting (pun intended) arse thread i hope you realize theres no 1 right way. Just vent the damn thing and get to cooking something already!
BTW.... i've built over 20 drums using the 2" exhaust. It works like a charm.
Pitmaster @ Lockharts BBQ
I cook the best brisket north of Dallas. Get over it.
Northern midwest director for OBR
BBQ Person of the Year 2013