I cannot exhaust out with a fan
I hope your not working in a sealed room. That said:
Try a plumbing supply house. There is pvc duct work which is easy
to work with and several types of fans that can be used to draw the
fumes through the line. That is the set up in my retail shop.
I have a small gable fan in my other shop. ( It's like a small 12"
attic fan ) It vents though 1/2 of the window. The other 1/2 has my
handler dust collector venting out.
If you can vent to the outside of your building you don't need
anything fancy just fuctional. There is also a type of 4" duct work
for dryer hose that is flexible, stiff, and metal. It's easy to bend
too. The metal tubes and pvc are a little more difficult to shape
around corners. I don't suggest the plastic dryer hoses. They tend
to colapse on themselves.