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Consumer Reports rates vacuums on "airflow through the hose for tool use".  I think "airflow" is a much better indicator of how well a vacuum can clean because it gives you an idea of how strong the "wind" is coming out of the hose.  The faster the wind, the more it can pull dirt and move dirt.  You can have strong suction in a machine, but if the design of the airpaths from "fan to finish" does not allow fast moving air, the vacuum won't clean well.


Just think of what happens to the upholstery nozzle on the end of the hose of a 12amp Hoover WindTunnel upright - the suction is very very strong, but that nozzle has no holes in it to allow the air to get moving, and so it does a "suction lock" on any fabric it's cleaning.


I guess airflow/airspeed could be measured in volume per second (kind of like car traffic - 200 cars per hour), whereas suction would be measured in how many pounds could be lifted by the end of the hose - like those bowling balls in the Oreck commercials!


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