- Shims to keep fan vent flanges level on contoured sheetmetal.
- Marine plywood for solid clamp frame inside the roof.
- Butyl sealing tape to pinch between sheetmetal, shims also between shims and fan vent flange.
- 3M UV stable sealing membrane to completely seal over the fan vent flange, screw heads overlapping onto the sheetmetal for decades of worry-free service.
- 3M adhesive primer to etch plastic and painted surfaces prior to applying 3M UV stable membrane.