Mounting Options/Specs
custom gable vents
Note : on pitched triangles j channel is on the bottom only because the vent is all the way up against the soffit in the peak and the top is typically screwed on.
J channel gable vents
standard nail fin
outside Front Flange
none- no fin
Aluminum with PVC coating 
Aluminum with baked enamel coating
Copper-16 oz. (typical)
PVC coated Steel
Galvanized Steel
Clear western red cedar
Mill finish Aluminum

9x9 vent mesh-poly coated charcoal colored
18x16 aluminum screen-charcoal colored
1/8" steel hardware cloth
                                          Cross Section of Aluminum Louver
cross section gable vent