8'x15' flowering room, 6" reflector flange?

[Dnutz]

Hey all, im looking to expand my grow room to an 8' x 15' room but am not sure on the decision of a fan... I have standard 6" flanges on my reflectors and would like to keep everything 6" but may have to upgrade to 8 inches and use reducers. Im lookin for input from someone who knows cfm calculations or who can tell me what cfm rating I should be looking for! Specifically an inline fan is what im looking to get.

Thanks all,
Keep it green!

 

[LlamaSchool]

How many reflectors? Do you have a lot of resistance in your ducting otherwise? Most importantly, what kind of fan and airflow are you working with?

I'm running 8" now on a 10" inline and it's probably not even worth it unless I'm going full speed.

 

[Dnutz]

i will have 2 reflectors on a light mover spanning the length of the room. Basically will be in a strait line for the ducting. maybe a total of 30* worth of bends. im lookin to find out what cfm rating I should look for to pull through a carbon filter and cool the 2 1k lights all at the same time.

 

[LlamaSchool]

Well, I think the idea is to exhaust your entire atmosphere once every 1-2 minutes. If your cielings are roughly 8', then 8x8x15 is 960 cubic feet. You want a fan that can move 500-1000 CFM. I would probably get an 8" centrifugal fan that does at least 750 CFM or more if you think heat will be issue. 8" ducting wouldn't hurt but I would just run 6" with reducers on either side of the fan. 8" is more expensive, more bulky, and it's harder to find flanges and ducting in the larger size.

 

[Lazyman]

I don't think it's necessary to try and exhaust your whole room through your lights unless you don't have a choice, I ran 4 6" AC hoods through 4KW of lights with a 6" Vortex at half speed and still had ~100*F air coming out the far end, just make sure you keep an eye on the outlet temps so they don't get too high and cook the end bulbs.