Originally Posted by gordon2
Ahh! I did not know about that (the Coleman design). I would not however call it a design problem on the part of Dometic but instead a misapplication since the Dometic unit is meant for a different type of roof.
Still an inferior design compared to the Coleman, especially if you consider what the ceiling and roofs are made of on stick-builts.
How many times could you remove the Dometic air box on a stick built using the same screw holes without wallowing them out?(rhetorical)
I like the idea of basing the standard engineering on the traditional and universal 14"X14" roof opening to accommodate vents, power vents and even A/C without other intrusions.
Still, having been a fleet mechanic, I found that you have to work with the engineering provided and look for solutions instead of mourning the faults.
Your solution looks like it will work fine.