This is the data i got. I like the right side page better which is day 2 and a litter more clear.
Overall i would say this:
1. The 4" blower has amazing range and power. Pulls 0.25amps on lowest setting.
2. The 120mm fan wins on efficiency. Seems to be just as powerful and move close to the same amount of air as the 140mm, with less power draw. Negative is the sound which is more high pitched. I wanted to use the 120mm but the noise it makes full blast is not pleasant to my ears.
3. The 140mm is more quiet. The sounds is less of a whine....more of a wind noise that blends and disappears into the background better. Pulls 0.66amps compared to the 120mm that pulled 0.33amps and they produced similar results with a basic wind meter through a tube test.