Installed the fan yesterday and monitored it for a few hours before putting the lil ones back in the box. Finally I am able to keep the light really close and have all the doors closed on the box and still keep decent temps. I am glad so far that I bought the more expensive version of the brand I went with.

440CFM Is probably more then I needed but once I add on the filter and possible extra cfl's to the box it might be just enough. Searching thru some adds for lights online I keep looking at those UFO Led lights and wishing I got one for the one side of my box where the light is not as strong.

Oh and if anyone has used big fans like I bought and thinks they run quieter hung on bungee or spring lines let me know. Currently it is bolted to the side of the box and tho it doesn't sound all that loud to me it may to guests in the house. I makes the box hum a bit and I am trying to tighten up anything that may vibrate like hinges etc. :yippee: