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I hate overheating modems or routers.
I hate losing or slowing down of my Internet connection.
This is one easy way out.

Materials:  8 pieces of wood, 4 screws, a computer fan, glue

Tools: miter saw, drill, screwdriver

Steps:
1.  Cut 4 triangular pieces of wood that fit the corner of the fan.  I will refer to these as "corner pieces" from now on.
2.  Drill mounting holes on the corner pieces to fit the fan, make sure airflow is not severely impeded by them
3.  Cut 4 stands, that will raise the fan a distance from the surface it will be on.  Sufficient height is needed to get a volume of air underneath that can be pushed up
4.  Glue the triangular pieces to the stands
5.  Mount the fan with four screws.  Make sure it is facing the right direction.  In this case, we want the air blowing upwards.
6.  Place the modem or router on top, and enjoy.

This works well if your modem/router has vents only on the bottom side like mine.  You might want to consider a different design otherwise.  
<p>Here is what I did, Parts: 80mm case fan, power switch, usb A connector.</p><p>took an old 80x80x25mm case fan and cut off connector soldered it to a switch i used an old one out of one of those window alarms (see in lower left). and soldered a usb A head to it, plug the usb into one of the routers usb ports for power, and poof cooler router. </p>
Thanks for sharing this but I still have 2 questions: how do you power up the fan? And won't the modem/router get full of dust if the air blows up?
<p>Fan is powered by 240Vac to 12Vdc wall wart. Its a switching converter type capable of 1A dc current drain.</p><p>Yes dust will always be a problem. One can always add a dust filter under the fan and sacrifice a bit of wind speed. </p>
Very professional looking! :)

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Bio: Just your average tinkerer
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