Inside the robot, a fan spins very fast to create a low-pressure zone, so higher-pressure air outside pushes in through the suction opening, dragging dirt along. More spinning speed and smarter design mean better suction.Does suction power matter more for carpets or hard floors?

Suction power matters most for thick carpets, pets that shed, or homes with kids who drag in mud, because stronger suction digs into carpets to pull out dust and dander. For hard floors with light debris, lower suction is fine.

Report 008026. Filed.