Fan CFM Rating?

Hey I was wondering if anyone knows about these FASCO fans and what their CFM rating might be?
FAN / BLOWER, Powerful 10 1/2"" squirrel cage
10.5" is a huge diameter I am wondering what kind of ducting fittings i would need to reduce this to a 4 or 5" duct.

with 1/5 hp and 10" around it should be pretty high. you wouldn't want to put it in a 4 or 5" duct unless you use a reastat to reduce the speed. For $20.00 more you could get one at Sams that is already mounted in a housing. Then use a register boot, which is regtangle on one end with a 6" round pipe connection on the other. VV

Sam's Club - Lasko® Max Performance Pivoting Utility Fan

Is this what you're talking about? I went to the store today and this is the only thing I found that could even remotely be used as a growroom fan.

Yers it is. Maybe I misunderstood. I thought you were looking for fans to use for exhaust. Those fans you posted would not work for moving air in the grow roon, they don't oscillate. VV

Yes I am looking for a growroom exhaust fan. So the setup you are suggesting would be to put the SAMS club fan somewhere high in the room and attach the register boot to the square end (any idea of the correct size, will it fit exactly, how do you clamp it down?) and then run ducting out of the room?

What size ducting would go best with the CFMs of this fan. The closet is 190 cu ft. and I am planning on a 400w HTG remote ballast HPS.