Do I understand correctly that I need to create 3 to 5, 1+ inch sized holes in both the top and bottom of my smoker-unit (the vertical positioned 55-gallon drum) to create a 'draft' for good cold smoking? I'm smoking, salt, garlic and chilis. Will this reduce the wet drops inside? Will it lower the temperature too much, or? The fire-box is an old Weber connected by about a meter of dryer flexi-hose to the lower portion of the drum. The fire-box sits about 12 to16 inches below the bottom of the 'smoking-drum'. Any advice is helpful.