Keep the exhaust fully open and control the heat w/ the intake vent. Go to smokingmeatsforum.com and do a search for SFB mods. (side fire box modifications).
The most important one is a charcoal basket to get the coals up a few inches off the bottom to allow more air flow under the coals and to allow the ash to fall away from the coals. . Also, most folks extend the smoke stack down to right at grate level.
Lots more help at SMF.com
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