jeese......
Good question - no idea what-so-ever.......and nothing in the FSM.
But, if you really need to know - you could measure the diameter
of the fan, multiply it by the depth of the blade, divide by 2, scale
it to feet, and then multiply that by the rpm - that would give you
cfm.
My pull-it-out-of-my-butt guess, would be 1000 cfm.
Good luck !