just graft a 4inch cheap fan on to the end of the hose. job done oh and fit a rubber mat on the mesh in tank leaving about an inch all round for the grit to drop back down . it stops all the crap and grit been blown back up from the gun it use then you cant see a bloody thing its all cheap and cheerfull but very functional . another mod i did was extend the hopper and make sides for it so that all grit drops down in the middle
A clothes dryer has a 4" fan in it, I've grabbed a couple "curbside" and pulled out the fan for such
usage.
Slide a plasma cutter gun up each corner, and viola, 3 nice sheets of metal.
Rest goes in scrap (or at curb)