optimal cfm for 100 cubic ft?????
- Thread starter LbUrNa
- Start date
Martin Jones
Member
http://www.jasons-indoor-guide-to-organic-and-hydroponics-gardening.com/proper-intake-and-exhaust-for-a-grow-tent.html
http://www.jasons-indoor-guide-to-organic-and-hydroponics-gardening.com/exhaust-fan-calculator.html
hope that helps a little, but my buddy too had questions about exhausting and he will be posting a new thread very shortly
http://www.jasons-indoor-guide-to-organic-and-hydroponics-gardening.com/exhaust-fan-calculator.html
hope that helps a little, but my buddy too had questions about exhausting and he will be posting a new thread very shortly
jondamon
Well-Known Member
ideally you should exhaust once a min, but that also depends on choice of lighting CFL's or HID's etc.
If you exhaust more than 3x a min then thats too much negative pressure and creates too much of a vacum inside your grow space.
If you have to exhaust that much then you need to go aircooled or choose a better reflector.
J
eighteenhundredwatts
Member
I hear and read people saying anywhere from once every five minutes, 20cfm , to three times a minute, 300cfm.
I personally lean towards 2-3 times a minute. However, I am striving for negative pressure to keep the odor from escaping the flow of air from my room to the outdoors.
With no odor concerns, I would agree with the above. Once a minute.
I would recommend getting a fan that is capable of twice a minute, then add a speed adjustor, and dial in the perfect speed.
This way as conditions change, you can deal with them. Also, you might want to go a little bigger one day. Unfortunately, there is no 11 on inline fans.
You should know that 100 cfm from a can fan/vortex or it's like is what I speak of when saying 100cfm.
A computer fan or booster fan is rated generously. If you are using these fans, I would go for 2 times a minute.
I personally lean towards 2-3 times a minute. However, I am striving for negative pressure to keep the odor from escaping the flow of air from my room to the outdoors.
With no odor concerns, I would agree with the above. Once a minute.
I would recommend getting a fan that is capable of twice a minute, then add a speed adjustor, and dial in the perfect speed.
This way as conditions change, you can deal with them. Also, you might want to go a little bigger one day. Unfortunately, there is no 11 on inline fans.
You should know that 100 cfm from a can fan/vortex or it's like is what I speak of when saying 100cfm.
A computer fan or booster fan is rated generously. If you are using these fans, I would go for 2 times a minute.
jondamon
Well-Known Member
I agree with the overspec i use a 440CFM on my aircooled 600w system to be able to turn everything down in winter up in summer .
Just so you know any negative pressure will stop leaks. Even powered intakes as long as they are more than 20% lower CFM's than the exhaust will still create enough negative pressure to stop leaks.
I personally run a sealed 440CFM 600w aircooled system , with separate Fan 150CFM / filter for exchange and scrubbing with a small powered intake.
J