Transformer cooling classifications

[onebryd2]

Hello,

In reference to the following question off of the Level II practice exam:

A given oil-filled transformer is 10 years old and has fans to blow air across its cooling surface, what is the class of this transformer?
Correct Answer: OA/FA/OFA

I've looked online and found a few tables with definitions that talk about OA and FA, but I have been unable to find info on OFA.

Was wondering if OFA means the same thing as FOA which indicates forced oil cooling using pumps to circulate the oil for increased cooling capacity?

Thanks.