CoolTube/Fan Arrangement Question

Is either of the layouts I'm showing here better than the other for the filter/fan/cooltube? Thanks in advance.

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Hi doco
Are you trying to cool the light with the air in your grow room?I think the heat
from the light is too hot to blow in to the carbon filter.You want the air in the room to stay the same temp.the carbon filter is too take the smell out of the
grow room.One fan for the light and one for the carbon filter.
The set up in the drawing is not right A. or B.The fan blows air in too the carbon filter .In your drawing B.cut the carbon filter off and you can cool the light and exhaust the heat out of the grow room.Hook up a fan to the carbon filter sucking the air in the room into the filter back out in the room.This will lower the smell in the room.Thats how it works two fans.

you always want to pull with an inline fan like that, so your B option would be the best. This must be a rather powerful fan, because of the distance, the amount of 90 degree bends (what will really lower your fan efficiency), and the fact that your pulling through a carbon filter and then through the hood and then through all the ducting. If its sealed up well enough and powerful enough fan...then it will work fine. Cool tubes will help make sure its entirely sealed.

The best way would involve 2 fans, which often is not feasible. If you could do that, then I would run a sealed cooltube so that air is pulled from outside the grow room, through the light, and then is exhausted back outside the room. This keeps it sealed so no filter is needed for cooling the light. Then use your filter to draw air from the room, exhaust it through the filter, and out the room with another fan. Use a passive intake if the room is sealed enough. This will keep all your exhaust smelling nice, and your light will be as considerably cooler because its drawing colder air from outside the warm room. But its 2 fans.

Thanks for the replys everyone.
I do actually have two fans - one is a 6" 449cfm Vortex and the other is a Dayton 4" 265cfm squirrel cage. I was planning on using the Dayton for fresh air intake but if passive would be sufficient, I can use it for cooling the light and put the Vortex on the Carbon Filter for scrubbing.

I'm gonna go check out Dusto2k3's thread again...he had a badass hydrohut but I think he used three fans in it.

Doco, ur right. 3 fans. I have a little 80 CFM inline duct fan in the lower opening in the hydrohut.