You are correct, the listed size for the CTX 1300 on the Gustafsson website is 15" above the rubber at the base. The standard Gustafsson offered windshield also has two open vents like the Honda tall screen for the 1300. However, when I ordered mine the contact person there was very helpful. There are options available. Get it with or without the vents. Get it with the Goldwing style vents, or get it at different heights. I opted for the 22" height to meet my needs. I elected to keep the standard vents. Like on an aircraft wing, the Bernoulli principle (Google it.), the high-low pressure affect pushes the air up on the back of the wind screen, and it does not blow directly in the face of the rider.