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Thanks guys!

All these actually seem like really plausible answers! I just always found it weird as a kid cause there was a transition time where you'd see a company like Hoover sell both their clean air units (Windtunnels) and dirty fan units (Widepath,Elite,Caddy Vac) at the same exact time, then they just kind of drop the dirty fan units like flies out of nowhere. This was a really insightful thread!