I've seen a few builds on here where guys put dampers on the exhaust stack. Is this necessary in a reverse flow? I've always smoked on my ECB and UDS and the rule there was to never close the top damper or the smoke will get stale. I think I recall reading somewhere about dampering the exhaust pipe as a last ditch effort to get the temp down after you've hut down all your fire box dampers. What is the opinion around here? Do I need to put one on my minismoker?