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READ DESCRIPTION! I had to make this episode because some people actually do this and a few have gotten hurt! HVAC is a complex topic; a lot more so than most people would think. Its enormously complicated when you start researching it in detail. Despite that, a few growers through history have tried exhausting their grow room air through their furnace chimney with no HVAC knowledge because it seemed convenient. A few have regretted it big time. Remember that your grow room fan is at least 4″ an
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