I used 3 3in strips in mine. I used that size just because I had a bunch of it laying around. You just have to make sure you don't put so much heat tape in the bator that your thermostat can't keep it cool enough-I made that mistake at first! I got my fan from Radio Shack for $10, seemed like a good deal to me since I didn't have to pay for shipping, and it even has blue LED lights on it
I put my fan there because I couldn't get it to stay on the top of the fridge. It worked just fine for me being placed there. I believe I have it blowing down, but I'd have to check.
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