Good evening ladies and gentlemen I have a situation that I've needed to deal with for a while my smoker has an airtight seal around the door I have an inch and a half inlet in the bottom 3/4 from the back my smokestack is 3 1/2 inches round placed on the top of my smoker also use the smoke daddy attachment for the smoke my problem is I'm not getting any draw I have to put a fan on the bottom where the intake is to push air to draw the smoke out how do I fix this my smoke stack does not have a damper