This is coming in a little late, but I figure someone may see this and benefit even if you're all fixed up. I was told to light a stick of incense at my workstation, and if I could smell it, I needed better ventilation. I did, and have recently installed the system described here:
http://www.andreaguarino.com/VENTILATION.html and it is AMAZING! I'd think that if you have an existing fan in the ceiling of sufficient power, you could find a way to seal up whatever length you need of the 6" flex tube to the fan inlet and run it down to sit right behind your torch like the one in that link, and that would be very good, especially to take out the vapors given off by the colorants in the glass. Those are worse for you than the products of combustion from your torch fuel.