Maybe a vacuum cleaner,either blowing or sucking,perhaps remove bag and final filter, will cool your welder.Only a small hole will be needed or use the fan head.
I painted an Austin Kimberley with a vacuum cleaner 30 years ago using oil based house paint and a very good job it did too! Cheap and quite pro.
I also stuffed my wifes vacuum cleaner 30 years ago when I accidentally "sucked instead of blowed" the red hot charcoal ashes from a producer gas unit I made for an old Massey Harris Tractor.Yes it worked well.David
