In Hood Systems:
290 CFM - 6" Round Duct
390 CFM - 7" Round Duct
390 CFM - 3.25" x 10" Rectangular Duct
600 CFM - 8" Round Duct
1200 CFM - 10" Round Duct
In Attic Systems:
392 CFM - 6" Round Duct
836 CFM - 8" Round Duct
1266 CFM - 10" Round Duct