thanks for the replies, guys.
i can vent it outside, there is a hole in the wall where there used to be a woodstove, 6" pipe. i could rig up something for that but then i have to wire in a fan and then have a 20' or so, hose flopping around to wherever i'm welding. i thought if i had a small filtered box with a fan in it and short hose, ie. 3'-4' then i could just plop it down wherever i'm welding and use an extension cord. the other way would probably work better, but would just cost more $$. maybe if i could hang it up out of the way it wouldn't be so bad. i could get an inline 6" fan and then reduce it down to a 3" or 4" hose.
BTW, yes, Stratford does have a very nice park system.