Fermentation chamber questions

[JimmyN]

I plan to build a fermentation chamber from a dorm fridge and a temp controller from an arduino, but have a few questions before I start:

Do I need to build any sort of vent to allow CO2 to escape?

How long is a typical cool down time for a fridge compressor? I'd be afraid of destroying it by cycling too fast, or not allowing ample time for the compressor to cool down.

Thanks

 

[Felixio]

Cool down time and cycling all depend on the size/power of the fridge, size of the chamber, ambient temps, temp inside the chamber when you start, and how well insulated the whole thing is.