Mount an exhaust fan as high as you can,this removes all the fumes and the heat too,but being high up it doesn't effect your welding gasses down low.
They don't have to be too big,just mount it on an exterior wall in the rooms needed and either buy or build some kind of door or flap that can be opened when running the fan and closed to protect from weather
Don't DREAM your life, LIVE your dreams
Never forget 9/11
"Welding is like a woman,Get 'er HOT and Penetrate"
Gotta LOVE a person who knows everything about NOTHING
The only Thing necessary for the Evil to win is a good man to do nothing....
"How far you go in life depends on your being tender with the young,compassionate with the aged,sympathetic with the striving,and tolerant with the weak and strong--because someday YOU will have been all of these"....George Washington Carver
Want to know what an Ironworker is and the job scope of a Journeyman?..click here...http://www.ironworkers.org/becoming/careers.aspx