Location: 08b Windows / Vents (A window)Frame thickness refers to the box around the louvers.
Louver parameters: Thickness, Spacing, Angle. The Louver Pen should be thin.
Exterior casing: Typical moulding options, or custom width and thickness.
Interior casing: Same deal.
Either casing can be turned off. The same Casing Reveal is used for both.
Masonry Cut Depth: Same as a window or door. Sill is drawn with the Masonry Sill Pen, though in most cases you would not see this vent in plan.