could not see, how, its a fan, free running. The only possibility is, air intake is slightly blocked. Plus does not have back pressure, no duct attached.
Or the capacitor as on the nameplate is wrong, reads 4uF run cap. And thats what I put in. Power factor is pretty good though.
edit: hooked up a 6m duct. If it lays flat, the air intake is partially blocked. Put it on some FC sheet, it kind of sucked it in, so it restricted the air intake. Now I got my 2 amps:
This would be plausible, because normally there is an air filter on the inlet. No idea, how much pressure drop it would generate. Rated rpms is 1320, not 1500. Interesting, that the more I block the air inlet, the less current it draws.
motor reaches 47 centigrade, stops there. On a 30° C day.
to get 250 W air movement need 20 m/s in a 10 inch duct, which would be 1000L/s.
Rated at 600L/s its 12m/s in a 25 in duct, or 50W.
measured between 16 and 20 m/s