Sun Vinyl new construction products have a standard jamb depth (thickness) of 1-3/4" from the back of the nail fin.
For deeper wall construction interior wood extensions can be added to the jamb up to a total jamb depth of 6-9/16". These extensions are applied at the factory. The wood is finger jointed paint grade. It is available with no finish, primed or painted white.
Note: Jamb Extensions are available in 1/8" increments up to 6-9/16" total jamb depth.