A louvred gate runs angled slats, typically aluminium extrusions set at 30 to 45 degrees, where each slat overlaps the one below. Looking straight on, the openings appear closed. Looking up or down through the louvres, you can see through and air can move.
Louvred gates do well around pools, equipment enclosures, and any street frontage where ventilation matters (plant rooms, switchboards, air-conditioning compounds). Common louvre profiles in Australia are 65x16 mm and 105x16 mm aluminium. A 30 degree angle gives tight privacy. 45 degrees gives more airflow at the cost of being able to peek through.
CAD60 measures the angle from the gate face: 0 degrees lays the blade flat in the face (closed), and 90 degrees turns it square to the face (open). The louvred models take the blade profile (flat, elliptical or aerofoil), the tilt angle, and the overlap or gap between blades as inputs, then regenerate the full orthographic drawing including the angled section view.