[DIYbio] Building an incubator, would like some opinions/help

So I am thinking of using a glass jar with sterile water and a sonic fogger to add RH.

Adding heat and stirring the air will be accomplished by a 12V 12A hair dryer. I think this MOSFET will work (the volts and amps are above what I need, but the power dissipation isn't) can someone confirm this will work or not?
http://www.onsemi.com/PowerSolutions/product.do?id=NTD5867NL

I am thinking two dampers (one-way air valves) with a small 100mm computer fan will be sufficient for reducing CO2 levels.

Because the fogger requires a specific water level for best performance, to reduce contamination I found this optical fluid level sensor setup... it just uses two LEDs and two photosensors.

So thoughts? opinions?
Thanks!

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-Nathan

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