A diamond-shaped louvered gable vent.
It is designed with the assumption that will have the shape of the diamond follow the roof slope in most cases. Like many roof-oriented objects, you can choose the Roof Slope from a list or enter a custom value in Slope Angle. When you change either the height or width, the other dimension will adjust automatically to maintain the angle and thereby the proportions of the shape.
I think the rest of the parameters are self-explaining: Louver Thickness, Spacing, Angle, and Pen; Exterior and Interior Casing Width, Thickness, and Material.
The vent handles a masonry condition by setting itself into the wall by the sill dimension. (Use the 'second' Construction Method button.) The sill is drawn with the Masonry Sill Pen.
