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do you have a pic of your setup?the 2 little fans will have to do.U haveto put it to a way where you got your fresh cool air coming in and the hot air is going out.My opinion you only need a couple degrees cooler and all the heat is coming from the light so find a way to cool that. i have a growbox similar all i use is 1 6inch to cool my 400,temps stay in the low 80s
read the 1st thread 4 dimensions and the tub is 10 gallons.What are the dimensions of that cabinet you have Dr. Blunt? How many gallons is that DWC container?
Nice advice but now that i have a peice of acrylic between the light and plants my heat hasnt been a problemThese are nice fans, and good price. IMO a lot better than the HD fan, and 130 cfm. Just make sure the transformer is big enough. If you want or need to hook up ducting to the fans you can get pvc toilet flanges (the piece that mounts to the floor that the toilet bolts to). They will bolt to the fan and give you something to connect the duct to. Some I have didn't even need to be drilled at all, the bolt holes lined up with the ones on the fan. You can put together a good 130 cfm fan for less than $15.
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