NEVER exhaust a Grow through a Furnace Chimney. I had to make this episode because some people actually do this…. HVAC is a complex topic; a lot more so than most people would think. *Read Description for helpful links!* 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" and likely bigger & runs 24/7! Your furnace fan is nothing to sneeze at either and turns on occasionally...and the chimney pipe is almost certainly 6" or smaller. When you try to push too many CFMs up a chimney pipe you can get backflow. Playing with Carbon Monoxide is dangerous.
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Exhausting to your roof due to odor? See my guide on Carbon Filters: https://www.youtube.com/watch?v=Ro5bFwg-Uag
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