Yes, at add a 3" vent, but put in the side at the top/back, not in the top like I did.
I also add a few more small holes 1/2"-5/8" in the bottom, too. I close them as needed
BTW, the temp guage isn't even close to accurate and the temp dial on the heating element is inconsistent.
Get a PID to control your temps.
I've tried the pellet tube and so far I don't care for it. I'll stick to the pellet tray.
Have fun...
-brian