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How to exhaust my 4x4x6'6" grow tent?
Posted 30 July 2009 - 02:46 PM
Posted 30 July 2009 - 06:33 PM
The size of your grow space and the capacity of your fan (especially if it is not air tight other than the ducting) will not produce enough negative pressure to create a reliable draw from your intake vent. Not to mention that you should be creating positive pressure rather than negative pressure, as this will produce a more sterile environment (pharmaceutical companies use Positive Pressure for all of their clean rooms, as do hospitals).
Place a powered fan on your intake as you will need much more fresh air than you are currently providing. Taking all the air out without a STRONG feed of fresh air will thin the air and help in retaining more heat. Fresh air is key mate, KEY!
You had stated that your exhaust fan was on the low side and your intake was on the high side. You need to switch them as hot air rises, and taking air from the lowest point in your room will take out all the cool air. General rule of thumb.
Try to create an even balance between both your intake and exhaust. Clean, fresh air will help your plant in so many ways, and the proper exhausting of that room (from the TOP of your room not the bottom) will prevent too much C02 from building up within the environment and reduce the heat factor immensely.
Try splitting your exhaust vent ducting inside your room so you are taking heat from your lamp (makes a world of difference with the heat) and your room.
Leaving all electronics outside or minimality with the amount of electric appliances inside your room is much safer and helps with maintenance as your plants will not be stressed if you need to access one of your appliances (fan, ballast, etc.)
Here's how I run mine.
Great post! Excellent advise about the positive pressure. That is another one of those misconceptions being spread through GC. Negative pressure is exchanging air before your plants get to benefit from the fresh c02. More air coming in than out!!!
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