So from what I read, the Ridgid draws 12 watts on high. So with the 5.0, that would be 7.5 hours on high.
With 4.0, that would be 6 hours on low.
So I may just go with the 4.0 battery then. The 4ah is 2 for $100. The 5ah is 1 for $100.
It's not worth an extra $50 for an extra 1.5 hours. So all together with the 4ah, I'm getting 12 hours, for the same price as 7.5 hours.
And what you saying is, CFM won't tell me how strong the fan is. And the Ryobi can actually be stronger the Ridgid.
Guess they's only one way to tell, buy both of them to test them, just return the less powerful one.
I just did an unscientific test with my Vornado. I took off the grill, stood in one spot.
Put the grill back on, stood in the same spot. I could feel more airflow with the grill, then without.