I spent today installing a Fantastic Fan on my Scamp
I had to fabricate a spacer for the fan so it didn't turn into a head knocker inside the trailer.
After the install was complete I read the installation instructions and found that they have thin roof spacers.
If your planning on installing a Fantastic Fan on your egg call Fantastic Fan and order a spacer. It's much easier than making one.
The spacer I made was 1 1/8 inch thick which makes the fan flush on the interior of the trailer.