Didn't see the other thread you mentioned, not sure what that's about.
IMO this set-up you describe is not enough ventilation. You should have the fan in the window as an exhaust fan, not behind you blowing air. Just my opinion. Place the melting pot directly under the fan so that it pulls any fumes outside. You won't get any lead fumes with a normal melting pot but there are other impurities in lead that create smoke and odor that you'll want drawn outside.
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