K5Vac
Tom,
Yes, that is what I find annoying about certain vacuum cleaners when they were used in the kind of working environment they weren't designed and marketed for. Many businesses have, however, successfully used the household Kirby cleaners without too much trouble and abuse, even in the years when Kirby did have proper commercial-use equivalents available such as the Janitronic (1968-69), the American Lincoln Super Sweep (1969-82), the Super-Vac 180 (1983-85) and the COMVAC line (1982-85).
~Ben