I really believe in venting a cooker, but you need to vent it where it's not allowing to much smoke/heat out yet not large enough to not do any good
My SRG's are vented with a 4 in on the top, this seems to be the right size for my style of cooing
My home built Pellet SRG is also vented with a 4 in vent . If those at the 2013 gathering remember I turned it to HIGH and boy did that thing get HOT
Terry and I talked about the venting needed so when I had the chance I vented it an dang it was perfect!
Now I do not own a PBC (yet
) but venting is very important
Here is the Pellet SRG vented
Here is the SRG vent