fan

I'm not sure if this makes sense or not but my grow box is at 73 degrees when my lights on but I added a little computer fan for strength of the top roots but it made it 102 degrees in there any ideas
 
Ok I figured out the problem its stupid but makes sense I have a fan that can be hooked up by USB and my exhaust fan has a hook up so when I turn the fan on it it pretty much slows the exhaust fan to a stop
 
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