How much CFM do I need?

M

MadButcher

Well-Known Member
It's certainly not too much. But you probably won't need quite that much. Dial it in with a speed control. I run a 4" with 170cfm at medium speed in a4x4x6 and my temps are damn near perfect.
With bigger than needed exhausts comes a hidden expense. All the air you blow out of the house has to be replaced and , depending of season , heated or cooled. That's at least how it is here. If I would run a fan your size, my water heater would exhaust I to the house from the negative pressure created.
 
CCCmints

CCCmints

Well-Known Member
Cx2H said:
Idk about that. Where in there did Dan or the other random grower they are using as a scientist, say too much air = x amount? Pretty sure they're guesstimating based on personal sheet?

I think, therefore I am.
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what? that link is just so OP can calculate how much CFM he needs for his room...you said yourself you were ripping your tent apart with the exhaust fan you chose. is that not enough for you to understand you will run into problems if you get a fan sized for 3x the size of your room.
 
Cx2H

Cx2H

Well-Known Member
CCCmints said:
what? that link is just so OP can calculate how much CFM he needs for his room...you said yourself you were ripping your tent apart with the exhaust fan you chose. is that not enough for you to understand you will run into problems if you get a fan sized for 3x the size of your room.
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Woah. The link you posted says to get 3x cf of the room.. was a friendly retort btw. #Uh

1500 cfm is about 12x of the 3x3
 
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