Sorry for my poorly worded title. I have a shelf in my house where most of my wifi and phone electronic house are. I noticed that it will probably get really hot in there. I'm not really good in cooling so I'm asking if anyone knows a good cooling system or fans for that? Here are some pictures: http://imgur.com/a/0fWzm
We will never close that shelf.
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As long as it's not to hot in your place then it should be fine as is. Everything is spaced out pretty nicely. Although personally I would think of moving the NAS, Modem, what looks to be internet phone box and power strip to the lower part of the shelf. Use a hole saw route the ethernet and power cables to the phone and wireless router on the shelf where they are at now. Prolly wouldn't make a difference temp wise but would look much nicer. Especially since you plan on leaving that open.