I don't have a drum, but with my vertical, if I have the intake open too far I get smoke exiting through the intake. I have to close down the intake and open slowly to restore a positive updraft within the cooker.
If possible, maybe consider using a drip pan so grease does not get into the fire...
Humphrey's DownEast Beast W/BBQ Guru
Last edited by IamMadMan; 07-21-2013 at 12:54 PM..