I cleaned my fan yesterday. It wasn’t clogged, but definitely needed it.
I had a close look and realized there is a design issue with the fan that likely greatly increases the rate of clogging. Namely, the fan has a spiral/curved blade cover on the back of it that is right up against the honeycomb of the duct port itself. That means that a lot of the honeycomb holes are divided by parts of the fan.
You can see it clearly in this image. There is the metal honeycomb, then the black plastic spiral fan housing, then the fan blades behind the housing.
This also makes it significantly more difficult to clean the fan blades.
If at all possible, the vent port really needs to be removable. Having the whole thing screw in or otherwise be removable would be tremendously helpful. In fact, I suspect that fan failure is going to be an issue in the coming months.
This was after cleaning. It was considerably dirty prior to going after it with a shop vac and some q-tips.