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Agreed, better pushing air in than out. Regarding where to connect it to, if it's a 110V fan you can connect it to the power going into the ballast, otherwise you will need to use a power adapter to run a 12V fan for example. I've used solar panels to run a fan once too, it works but it's a little more expensive. My suggestion is to go with a 12V computer case fan and connect it to a variable voltage power adapter, this will allow you to drop the voltage at will to slow down the fan and reduce the noise. I find 4-6V to provide little to no noise and still a good air flow. I have a single computer fan running on 4V to cool down my canopy with 250W MH and 110W CF and it's working very well.

Hope that helps
Giancarlo Podio
 
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