george j warner
Registered on
Sep-02-2006
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Message #84405 posted by george j warner (Info) December 17, 2007 13:33:23 ET
In Reply to: Re: help temp question.....plz posted by ineedanewname (Info) December 17, 2007 12:30:03 ET
air flow is far far more important than humidity ,,, humid conditions are good for veg growth but not nessissary , but if you shut off the airflow they will starve from lack of co2 !
The air in any given grow room has to be changed every 2-3 minutes not 5 !
and the calculation goes like this (you almost got it right)
and its in meters not feet!
1 foot = 0.3048 meters
length x width x height = A ........ A x 20 changes per hour = the fans air flo m3/hour : )
yours
5 x 0.3048 = 1.524
7 x 0.3048 = 2.134
1.524 x 1.524 x 2.134 = 3.252 x 20 = 65 m cubed/hour
so his 80cmf will be fine ...for now , tell him to save up for a 4" grow fan (175cmf) better for when you got bigger lights in flowering with more heat !.. i wouldnt trust anything less than a 4" grow fan, my rooms in feet ..
3ft x 8ft x 8ft and i got a 6" (450m3/hour)when only a 80cmf would do ... but if i ran an 80 it wouldnt be able to expell the hot air from the lights !thing is with a bigger fan is you can link it in to a fan speed controller (a dimmer switch lol) and slow it down to half speed then its quiet and still shiffting massive ammount of air and sucking in more co2 : )
if hes in veg he shouldnt need a carbon filter yet .. its a waste lol.
hope this helps
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