Kingsnake235
New Member
Hey there!
not sure where this should be posted; please feel free to move to somewhere more appropriate if necessary!
I am in the process of readying for my first personal grow (link to relevant thread in signature) and I have a few specific questions regarding ventilation, fan size and the CFM relationship to the connected ducting.
My space is not setup yet, I am trying to sort out the odds and ends while i have some things coming in the mail.
so:
i will be running 600w HID on 6" cool tube; my question is, should I just immediately use all 6" ducting and a 6" fan @ 160cfm? or would there be any advantage or disadvantage to stepping up/down the fan or the ducting?
my options for fans at local HW shop are
4" @ 52dBA and 60cfm (80 "boosted" whatever that means)
5" @ 51dBA and 140cfm 220 boosted
6" @ 50dBA and 160cfm 250 boosted
they say they are multi speed, i assume that is in reference to "boosting", but not sure what that means or how to achieve this, possibly with a fan controller? ( i have read much about this and while it is not "advised" to wire a controller onto an AC fan, i know a lot of people have had no issues when using something like a ceiling fan dial or some other higher draw switch)
will these fans work?
my space is 2x5x8 for 80ft3 so 160cfm a minute will refresh twice a minute. is this too much ventilation?
i will build a carbon filter at whatever size ducting/fan i decide on, with activated carbon internally and a fabric filter on the outside and have read it could reduce cfm by 30%, is that an accurate reading? putting it to around 140cfm.
if i step the ducting down to a 4" and use the appropriate fan at 60/80cfm, will this still cool the 600w light if arranged as such:
[filter]>>>>[light]>[fan]>>>>[output]
or will i need the extra power of a larger fan to cool the light? again, if larger, how much cfm is TOO much? i don't want to have to use co2 or put the fan on a separate timer to the light.
it is also entirely possible that i am over thinking this and i should just use a 6" fan with 6" ducting and wire a controller onto it to adjust the speed down if necessary. Or a independent light cooler and separate exhaust?
it is currently pretty cold in my area so heat conservation is a consideration, outside temps around 0-5*c during the day and -2 to 1 overnight with humidity from 60-80% outside - i can keep the ambient temperature in the house around 12-5*c (have not measured indoor humidity yet) so i need to increase the temp in the grow by 10*c or more consistently and would like the fan to be somewhat quiet, but don't have the funds to drop $100+ on a fan.
thoughts?
not sure where this should be posted; please feel free to move to somewhere more appropriate if necessary!
I am in the process of readying for my first personal grow (link to relevant thread in signature) and I have a few specific questions regarding ventilation, fan size and the CFM relationship to the connected ducting.
My space is not setup yet, I am trying to sort out the odds and ends while i have some things coming in the mail.
so:
i will be running 600w HID on 6" cool tube; my question is, should I just immediately use all 6" ducting and a 6" fan @ 160cfm? or would there be any advantage or disadvantage to stepping up/down the fan or the ducting?
my options for fans at local HW shop are
4" @ 52dBA and 60cfm (80 "boosted" whatever that means)
5" @ 51dBA and 140cfm 220 boosted
6" @ 50dBA and 160cfm 250 boosted
they say they are multi speed, i assume that is in reference to "boosting", but not sure what that means or how to achieve this, possibly with a fan controller? ( i have read much about this and while it is not "advised" to wire a controller onto an AC fan, i know a lot of people have had no issues when using something like a ceiling fan dial or some other higher draw switch)
will these fans work?
my space is 2x5x8 for 80ft3 so 160cfm a minute will refresh twice a minute. is this too much ventilation?
i will build a carbon filter at whatever size ducting/fan i decide on, with activated carbon internally and a fabric filter on the outside and have read it could reduce cfm by 30%, is that an accurate reading? putting it to around 140cfm.
if i step the ducting down to a 4" and use the appropriate fan at 60/80cfm, will this still cool the 600w light if arranged as such:
[filter]>>>>[light]>[fan]>>>>[output]
or will i need the extra power of a larger fan to cool the light? again, if larger, how much cfm is TOO much? i don't want to have to use co2 or put the fan on a separate timer to the light.
it is also entirely possible that i am over thinking this and i should just use a 6" fan with 6" ducting and wire a controller onto it to adjust the speed down if necessary. Or a independent light cooler and separate exhaust?
it is currently pretty cold in my area so heat conservation is a consideration, outside temps around 0-5*c during the day and -2 to 1 overnight with humidity from 60-80% outside - i can keep the ambient temperature in the house around 12-5*c (have not measured indoor humidity yet) so i need to increase the temp in the grow by 10*c or more consistently and would like the fan to be somewhat quiet, but don't have the funds to drop $100+ on a fan.
thoughts?