mini torch local exhaust ventilation

Hi. I recently picked up a mini torch (little torch made by SMITH), and
an oxy/acetlyene rig for doing small metal sculpture. I want to set up
a local exhaust system for ventilation, and I'm trying to figure out
how much air i need to move. I'm planning to run a 4' flexible hose
(like you have for your dryer) from my work bench to a fan and out the
window. My dad found some neat fans that would work perfect for this:

http://www.smarthome.com/3011.html

My main question is this: How much nasty fumes does the mini torch
produce, and therefore how much CFM does the fan need to move? Does
anyone know?
thanks much.

wrote:

My main question is this: How much nasty fumes does the mini torch
produce, and therefore how much CFM does the fan need to move? Does
anyone know?
thanks much.

Most of your aren't going to be coming from the torch; they will be coming
from the things being heated. Some fluxes are nastier than others.
Charcoal releases fumes. Some brazing solders have cadmium.
So, you have some choice about the amount of nasty fumes you'll be
producing.
--
mbstevens http://www.mbstevens.com