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I created this device to extract harmful fumes from welding.
All you need is :

• 12V PC fan 120x120x25
• Switch 19mm
• Jack socket
• Carbon filter
• A 12V 1A power
   

It's a very simple design, three files Back, Front and a spacer to prevent the fan blades from damaging the carbon filter

I was inspired by different existing designs on the net