Its a dust extractor for car repair shops. Designed to hook up to many of the large workshop boom-arms, which in turn allow many tool sander operators to work around cars all day without having to worry about moving a dust extractor about behind them.
I wanted to put on in our workshop, but was saddened to find out they are not designed for wood dust removal.
The issue is to do with dust gathering in places that might cause a potential fire hazard. Which may be just a filter related thing, or a fundamental design thing - I'm not sure. But Festool here don't recommend them being used in wood shops.