Quote Originally Posted by cypher420
do you mean the "Fans - Not Just Blowing Hot Air!"? I gave that a read, little confusing but the got it for the most part hehe. So how do I know what speed to set the 340cfm inline fan? If theres ducting and obstructions do I just guess? So without changing fan speed it would just stay at full strength and that would be too much?

I drew a setup of what I imagine it to be like. The other thread talked a bit about vertical growing, but i think with my reflector its best to stay horizantal.

they were also talking about "flanges". I had no idea what those were lol i looked it up and seems there just like washers or something. do i need those or can i just duct tape everything to the ducting?
According to your drawing, you have only one fan blowing outside air through the light, and then thru the scrubber and out. That's not correct, the scrubber has to be where your fan draws the air from. You have the fan drawing from the outside. You can if you want (its not as good, but works) have your fan pick up air inside the tent thru the scrubber, then continue the air flow thru the lights and out. What that would do is pick up the warm stinky air inside the tent, clean it, and then push the 'warm' cleaned air thru the light and then out. Its not as efficient, because taking cold air thru the lights obviously would keep the temps down better....but I have run up to 5 lights that way in the past. It will work, but not quite as well as a dedicated fan just blowing the fresh air thru the light.
I've worked in the HVAC industry for about 10 yrs, and can tell you that a 6" passive air inlet is not enough for incoming air without forcing it thru using a fan. It should be at least twice that size. What you need to think about is removing the warm air and replacing it with fresh cold air. In order for that to happen, the best way is to exhaust the hot stinky air OUT of the tent thru the scrubber, so your neighbors don't smell it. Of course the air would be replaced with air coming from your passive air inlet.