cfm for fans?

[loylty gets u nothing]

hey guys

i gotta get another fan

this time im going off the room calcs and they say

64.7 cfm????????

ive never payed attention to that sort of stuff

so im wondering wat will be an appropriate fan to match that rating??

inline or centrifugal doesnt really matter although stealth is an issue..

thanks for ya help guys

bil

[Indycar]

Has ya new fan shat itself billo?

 

[loylty gets u nothing]

no indy she runs strong

i just need a new 1 to replace another

i thought id try and be sure to get the shit right

instead of skimping like wen i 1st established..

all help is appreciated guys

bil

[SukonmiSkunk]

CFM... is cubic feet per minute.. it relates to how much air the fan will move... now I would say you would want to change the air in your grow room about 1-2 times a minute... so... work out the size of the grow space.. ie.. 4'x4'x 8' would give you about 24 cubic fet of grow space.. so a fan shifting 50 cubic feet per minute... now if you are running ducting.. with a carbon fitler... the filter would probably put about %50 resistance on the fan motor.. cutting your fan speed by about half.. so you would opt for a fan shifting 75-100cfm... or greater.. I certainly wouldnt be going below that...

 

PS... if we have a member that knows more about carbon filters and the resistance on the fan loads please post the info.. I think its pretty important so as not to get caught out buying a fan that wont do the job...

[Frazz]

Yea billo i dont know too much here, but im curious .. do you mean you need a fan that moves 65 cubic feet per minute ..

 

some of the fan makers (Allvent) market thier fans according to thier cfm or lites per second ability .. like allvent 100mm inline fan rated@ 33 lps

 

this helps ; 1 litre per second = 2.118 88 cu ft/ minute ...

 

 

Sukonmi Skunk

there is a chart containing all simple formulas needed to calculate all this, can be found here http://hollandforge.com.au/en-us/dept_102.html

 

click on the Calculation Worksheet at bottom of page... PDF format