Patent Pending adapter matches the contour of the OEM roof so the Maxxair Dome mounts to a flat surface. Prevents distorting the roof sheet metal or vent flange and can be used as an aid for locating the fan. They are CNC machined out of UV and fire resistant expanded PVC. The fan mounts to the outside adapter. The adapter ID is 7" and the OD is 10.5"
Center and off center is in reference to the center line of the roof. The off center measurement is from the center line of the van to the center of the hole.
We will reach out to you if you are ordering an off center adapter.
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