I would recommend that you don't use the fan to pull the fumes out, if you have a good seal on the tank hood, you could push the fumes out by having an inlet fan. This way, the fan could be several feet away from the tank, and any possible corrosive fumes.
I would recommend a duct fan, the ones that fit right inside a 4" diameter duct. You can buy them from any home improvement "box" store. They run off of 120vac
You could also look for 120vac fans used for rack cabinets. You could find this at a salvage depot that sells old high tech stuff.
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