I have not been able to find out. Whether airwatts is really useful for the non-engineer remains to be seen. The best way to deal with clogs is to prevent them. When using the vacuum system and finished an area, before shutting it off, allow the unit to stay on for a minute or so. This will give the dirt time to get to the power unit.
Problems can arise when the objects are too massive.
While the dirt is moving, there is no problem but when stopped the stuff loses its momentum and just sits or barely moves when you vacuum again. Nails, large hairpins, pencils and other things that are long, can be picked up and most of the time make it to the power unit but sometimes can get caught on the way. Pick these things up before vacuuming. Sawdust will clog it up because it is too massive and damp. Systems designed for sawdust are much more powerful with large piping.