Looks like your Sanitronic will need a new fan-see age cracks in the plastic fan-thats what I HATE about those plastic fans-they crack as they age.I wouldn't run the machine at "hi" hose speed until you can replace the fan.The fan in the machine may "explode"-fly apart from the high hose speed.Would be great if you could get a metal orig fan.Kirby puts the plastic fans in(or another vac tech)sometime during the machines prior life.