Soldering fan filter

grabcad

needs to be revised if you want to make it but after some modifications by hand mine is good for my needsusing a 130mm bequiet fan (from one of their PSU) and a 12V 3Ah battery so it should have a batterfy life of ~8h (4x less would have been enough but that was the battery I had)the grill holding the active charcoal filter in front of the fan isn't very sturdy so I added a metal gill behind and held the plastic one with metal wiressame for the fan frame fixation to the base, I added hot glue to secure it well in place