Quote Originally Posted by turtle420
I would go with the Daytons...

Just because they've got more, um, 'history'.

The 4" duct, you can build your self... or get an Air Conditioner Contractor to build you a nice one with some sheet metal. The Active Air fans, to be quite honest, I'm trying a couple of pages I googled but I'm not getting anything. It's probably my piece-of-shit ISP. Anyways, I have a link to the dimensions of Dayton fans, if you want.

I'm not putting it here because I'm not in my computer.... but I'll check back later, and if you're interested, I'll post it.

I also have a link to other fans (the link is in the 10k Dream Grow Room setup thread) that seem kick-ass for these applications... forgot the name.

PS: Creator, can I please get your input (if any) on the 'fogger' system? http://boards.cannabis.com/showthread.php?t=40838 Thanks!
Turtle420 I myself own a Active Air 180CFM Exhaust Fan and they seem to be really good. You can see them at http://www.hydrofarm.com/content/vent_envir.htm since you said you were having trobule. I was looking into buying a new 465CFM Exhaust Fan so that's why I brought up this topic.