I'm setting up a first grow and the last remaining hurdle is ensuring adequate ventilation. Here's the set up:

4' x 4' x 6'-6" Grow Tent w/ a 600W HPS. Not a cooltube, but Easycool (I think, basically same concept with larger reflector). It's got a 6-inch "port" for ducting on both ends.

So, my grow room has a volume of 104 CF. The grow tent I'm getting has 4-inch vents, and it seems the largest fan I can find in a 4-inch inline is like 172 CFM. This is the expensive Vortex. So, that would give me over 1.5 air changes per minute, which seems plenty adequate to me, although I've seen various opinions on this. What do you think?

Now here's the weird part. I only have 3 x 4-inch vents. So here is my plan. I'm going to have duct coming off one of the 6-inch ports in the light and the other port in the light will be an open intake. I'll have to get a 6-in to 4-in reducer and then route that out one of the 4-inch ports. This will have the 172cfm vortex fan pulling air through the light and out of the grow tent. The other 2 x 4-inch ports I was going to just leave open as intakes (with a filter since it's in a dingy basement). So basically all of the air in the grow tent will be pulled through the one open end of the light, over the light, and out the grow tent. Is that OK? What do you think are my other options in a tent with limited ports like this? I'd like to get away with only one ventilation fan (and of course another inside to circulate the air) which seems possible if it's sucking enough air.

Also, I have a lot of questions about how/where to mount the inline fans and such. If anyone has any good links/posts or anything, please steer me there.
lampost Reviewed by lampost on . Ventilation setup - Any problems with this? All air over light... I'm setting up a first grow and the last remaining hurdle is ensuring adequate ventilation. Here's the set up: 4' x 4' x 6'-6" Grow Tent w/ a 600W HPS. Not a cooltube, but Easycool (I think, basically same concept with larger reflector). It's got a 6-inch "port" for ducting on both ends. So, my grow room has a volume of 104 CF. The grow tent I'm getting has 4-inch vents, and it seems the largest fan I can find in a 4-inch inline is like 172 CFM. This is the expensive Vortex. So, Rating: 5