grow room ventilation discussion
Grow room venting tips.
Ventilation is one of the most important aspects of designing your new growroom. If the plants can't breathe, they can't grow.
This type of system we are discussing here is known as an Active Exhaust, Passive Intake System.
Mounting the fan in the exhaust, sucking air out of the room accomplishes a couple of things...
Since the exhaust is at the top of the area, the fan will suck the hottest air out of the area first.
The fan is actually lowering the air pressure inside the area. Any incidental pinholes or leaky seams will simply draw air in. If the fan were blowing IN, those pinholes and leaks would allow potentially smelly air OUT.
In this setup, your intakes, located near the floor, should be atleast 1.5 times the size of your exhaust.
You need to exhaust the room, so you can introduce a new supply of co2 for your babies.
You also need to ventilate your grow room to control heat.
Some helpful tips for a successful ventilation system:
Use a high quality exhaust can-fan. Plan on spending around $200.00 for this fan. The higher the cfm the better. I am not going into cfm's in this tutorial.
We'll save cfm's for another discussion.
Take the size of your exhaust fan, and multiply it by 1.5 for placement.
This means: if you are using an 8" exhaust fan, it should be atleast 12" away from any wall.
Also remember that when ventilating any space, the volume (VOLUME, in cubic feet or cubic meters... [L x W x H]) of air that goes IN, also has to come OUT.
· You can’t expect to ventilate a grow space by simply forcing air in, and not providing an exhaust vent.
Any bends, reducers and so fourth will lower your cfm, so try to make a clean run, or make allowances for this by buying a more powerful fan.
You may want to cover intakes with pantyhose or cheese cloth or something to help prevent any infestation into your growroom.
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