Upgraded Fantastic Fans -
Our fantastic fans were model 2000DM, where DM means the switch to raise and lower the dome is Dash Mounted. We got rid of the Max Air covers that were in poor condition, but now rain could enter if we forgot and left them open.
After talking to Fantastic tech support I learned they have an upgrade kit that adds two features: reversing motor and rain sensor. This changes the model to 2000RDMS (Reversing Dash Mount Sensor).
So now if it rains the dome closes. ;D Not that it rains all that often here in Oregon.