The amp draw of a VS ECM will vary with how hard the motor is working to move its set CFM.
At .4 static moving 1200 CFM it will be low. At .8 static moving 1200 CFM it will be high.
Same amount of air, but different amounts of work to move the air.
At .4 static moving 1200 CFM it will be low. At .8 static moving 1200 CFM it will be high.
Same amount of air, but different amounts of work to move the air.