Lately I've been soldering quite a bit at home and thought a fan based fume extractor would be a good investment. I came across this MAKE video recently that describes how to build one that fits in an Altoids box.
I dug around in my junk box and found a 24VDC fan. This fan was a bit too deep to fit in a single Altoids box and still have room for a carbon filter, so I had the idea to solder two Altoids boxes together. One would house a 9V battery, the Switch and the Fan. The other box would house 1/2 a Pet Co. Aquarium Carbon Filter and one more 9V battery.
Below is what I came up with:
Now I can solder away all day and not get a sore throat from all the flux fumes!