# Questions about finding the right ventilation system.

Discussion in 'Grow Room Design/Setup' started by XxMFDoomxX, Sep 25, 2010.

1. #1
Last edited by a moderator: Sep 25, 2010
So a few questions i have here i have read that LxWxH/5 is the way to find out my cfm. Is the 5 the minutes it takes for the air to fully circulate a room? When i plugged my grow room measurements into that formula i end up with this.

Math-
[LxWxH]/5
[6.5x3x8/5
=31.2Cfm

Does that math look correct? Is 5 a good amount of time to circulate a room or should i go with like 2-3minutes? Thanks for the advice guys my plan is coming along great with the help of all you great growers!

Edit: Do inline fans run air in and out(Newb to this stuff)?

2. go with at least a 50cfm fan for your space.

no, inline fans only move air one direction.

3. #3
Last edited by a moderator: Sep 25, 2010
This is just for air circulation though. Your going to need more then that to cool your room, I'd get at least a 6" fan (400 something cfm depending on the fan).

4. LxWxH=CF,CFx3(air circulation)=CFM, x2 for carbon scrubber

5. 6.5 feet x 3 feet x 8 feet = 156 cubic feet of grow space

156 x3(removing the air in your grow space three times a minute)=468 cubic feet a minute

468 x 2 for air restrictions on your fan = 936 CFM rated fan