Above floor cleaning.
The junior cleaners had a much more air tight connection between the tools and the fan. The connector from the hose extended into the body of the machine, and sealed with the fan chamber, locating around a slightly raised edge to the fan hole.
This meant that the suction via the hose was reasonabley adequate, and in comparison to the senior/convertible machnes, it was outstanding.
Although it was never going to create a small black hole when used, it was an effective tool owing to its much superior sealing of the air path.
I hope this helps.
Happy hoovering guys.
Clark.