I "somewhat" solved the problem by removing the 6" inline that I had air-cooling my 400W and using only a 6" inline for cooling my light and room exhaust.

Makes it so it gets hotter in there quicker than before with a dedicated 6" cooling my light by its lonesome.

Ha, I will use a 4" inline so temps will be that bit higher and buy a huge 1 for nxt. summer, thanks for the response thought I had selected an invisible font there for a minute. 8P

+Rep'd

i found dirtysteves post that answers your question. the pic is also here. Fans making my head spin! thanks steve.

Simple,
You need
1. 1 attic thermostat, they keep it near the attic vents and roofing supplies.
2. 1 5 Amp or better rated fan speed controller. In the ceiling fan section
3. 1 2 recepticle gang box
4. 1 Male plug
5. 1 switch/outlet cover combo
6. 1 duplex outlet rated at least 15 amps
7. A few feet of minimum 14g wire. I just had some 14/2 w/ ground laying around and i used the male end of an old extension cord for the male plug. You could probably get a cheap 6' or so extension cord and use it for your wire and plug. Just make sure it is rated at least 15A.

The speed controller and thermostat both have 2 black wires coming out of them. You take your Hot (Black) wire from your plug and connect it to one black wire each of the speed control and the thermostat. Then connect a piece of insulated 14g wire to the other black wires from the speed control and thermostat. Connect the loose end of the 14g wire into the "HOT" side of your outlet. The white (Neutral) wire from your plug will connect to the "neutral" side of your outlet. The outlet is marked so it is easy to figure out. Then connect your ground wires. Then put it all together in the gang box. I fastened mine to a piece of 3/4" plywood to keep it all neat. The photo has different parts but the same wiring is used. I just put an outlet on mine for ease of operation. Any fan I plug into that outlet will be run by the speed control/thermostat. In case I needed another fan. Hope this helps. If not, just let me know.

Thanks, that's actually very helpful.

And thanks to Steve for initially posting that.

bob you end up building one? i have 2 they work perfect.

Nah, doesn't seem like I'm gonna need it, truthfully - until it gets down to under 50 degrees in the garage (if ever), the exhaust fans run enough for my liking in my veg tent.

Once it hits 75 they turn on and turn off at 68 or 69, then turn on again in a bit when the temp goes back up.

If it gets cold enough that they don't come off as often as I'd like, I can just lower the differential on my TMP to three degrees instead of five (might do that anyways just to keep my temperature "band" a little more narrow).

I have an electrician about to be finished wiring me up for 60 amps in the garage, so I'm gonna put a portable AC/heater in there to always keep it at right about 68 degrees.

Plus I'd probably electrocute myself.

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Check out my journal for links to Youtube videos of my setup:

http://www.rollitup.org/grow-journals/250027-bubblelicious-new-york-power-diesel.html

I have used a small PC fan that runs 24/7 along w/ a larger fan hooked to a thermostat.
you could also add a small passive vent at the top -heat rises so it will draw fresh air in

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Where are we going & what am I doing in a handbasket?