Shade for Fantastic Fan
Call United Shade at 574-262-0954. Tell them you want the same shade they sell to Airstream for fitment into the Fantastic Fan frame. Frame size is 13 1/4"x13 1/4". The shade is 13" wide to fit just right into the opening. This came standard on our 2019 FC 25' RBT.
You may also consider installing the Fantastic Fan "Ultrabreeze" covers on the roof of your Airstream. You can leave the fan door open much of the time without worry of rain coming in. They come in white, smoke gray and black. Cost is around $60.00 and you want to order the optional bug screen for an additional $10.00. Takes maybe 15 minutes to install. I also disconnected the rain sensor in both of our fans as they would close up at the first hint of rain. Even with the "Ultrabreeze covers on and no rain droplets coming in they would close up and turn off the fan. PITA!
You may want to wait on the shade if you install the smoke gray or black covers as the light would be cut down. I installed the white covers and are very happy with them. I put these on both of our Airstreams.