When you have your PC in the Attic, it can be really hot in the room.
Inspired from the projects here, i have build my own easy solution for 1-3h cool air.
2 Fans http://www.reichelt.de/?ARTICLE=110418 ( works also with 5 Volt ).
IsoBox: My is from this part: http://www.reichelt.de/?ARTICLE=164898
Cut out the overlap parts, but do not cut through, and watch your fingers :)
Cut 1-2 slots for the fresh air to come out.
At the top, cut out the holes for the fans, and glue them in. Hint: The fans should suck the warm air.
I had a USB Cable for Power: http://www.reichelt.de/?ARTICLE=164898 Before you connect the cables together watch the poles!
Step 1: Cuts and Glues
Make the slots not to big, and look up, so that the glue not blob on the propeller from the fans.
bring the cables together and....
Step 2: Put Something Cool In
I have for testing some cool packs from the freezer. Put them in the box.
you can run with this both fans over an USB Port, because they use together a power of 120 mA
For turn off and on, i have this little helper http://www.reichelt.de/?ARTICLE=164898 Sure it works also another way, but it was there. :)
For hold the cap down i use a band from a old headlight.
So thats all.
Keep cool! :)