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Optimizing Airflow and Humidity in Grow Tent: Balancing Intake and Exhaust Fans

CornerBud
CornerBudstarted grow question 1y ago
Intake fan: 180m³/h, exhaust: 340m³/h. Tent appears sucked in—is this problematic? Is equal airflow crucial? Struggling with seedling humidity; excessively dry (50-55%) when the humidifier is off. Need advice on balancing air circulation for optimal conditions.
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Setup. Ventilation
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m0use
m0useanswered grow question 1y ago
not a problem, pressure differences will cause the fan to die faster but some amount is expected. When the tent is "sucked in" its under negative pressure, this is good for keeping smells inside the tent as it means the pressure is always lower in the tent and smells can not escape as the outside pressure is higher and always moving into the tent to equalize it. If it was under positive pressure it would look bloated, but you would need air pushing into the tent to get that vs sucking it out. Slight negative pressure is good. keeps the air moving and smells trapped. Slight positive pressure is not really needed. it allows smells to escape.
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Scrubbyjimbob
Scrubbyjimbobanswered grow question 1y ago
Negative pressure isn't bad, especially when running a filter. You just don't want TOO much pressure or you burn out your exhaust fan early though. If you have an actual intake fan you're probably fine. Many people just use passive intakes. If you need a humid space for germination/seedlings then get or make a humidity dome, a lot easier than trying to control the whole space. A clear plastic tote turned upside down works fine. Just mist the inside of the dome(but not plants) a couple times a day.
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