At this point, the blowhole on the left has been enlarged, where previously there was a 80mm hole. The right blowhole has not been finished yet. My jigsaw blade broke, but fortunately I had a spare one. If you are using a jigsaw or dremel I'll give you this piece of advice: always try to cut INSIDE your marks. You can always come back to make it a little bigger afterward. The next picture show both blow holes done along the broken jigsaw blade.

Now we have big hole to mount fans, but nothing to hold them in place. To make you screw holes, you will need a drill. The mesh size to use depends on what type of screws you are using. Again, use the fan to see if your marks are fine, its better to check twice then be sorry. Before you start drilling, I used my dremel to make a little crevasse in the center of each mark. This way you are sure that your drill won't wandering when you start piercing the hole.

Cutting metal with a jigsaw leaves you with rough edges which don't look very clean and can be sharp. The best tool to clean those edges is the dremel. If your blowhole is not perfectly round you can retouch them with the dremel. However be careful when using this tool on a side or top panel. You can easily scratch the paint on them with this tool.

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