These are metal prepainted white aluminum hood for 8, or 10 inch duct. They are suitable for outdoor exhaust applications. Note that unlike many hoods, these do not include built-in back draft dampers.
Dimensions (FML 8): 10.0 inches square, 5.7 inches deep, 3.3 inch long connector
Dimensions (FML 10): 10.0 inches square, 7.0 inches deep, 3.3 inch long connector