questionsrecommendations on a wine cellar?

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First rule of thumb is always buy with a larger capacity than you think you need. You want it to hold 30 bottles? Buy some thing that holds 50. Remember that some bottles are a bit fatter or longer than usual and won't always fit straight in, so you'll need the extra space.
If you're stuck for floor space, you might want to consider a forward exhaust style so you can tuck it into a small area/corner.

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http://www.galtwine.com/Articles.html ... provides more general insight into your options and what should be considered.

I have no affiliation witht hese people, but do know them to be the most knowledgeable and straightforward resource.