I actually wear a respirator when I solder. If I do accidentally get a single good whiff of the fumes, I can feel the acid in my lungs for a couple hours. So yeah you could say fumes are a problem. THe problem is that it'd be fine if air always moved in through my door at out the window, but sometimes it flows the other way so it ends up blowing in my face before it leaves the room. I just need to get the fumes to bypass me on their way out the door or the window.