Single-layer louvered air outlets are commonly used for suction and blowing air in pipelines, and can be equipped with a hinged gate (multi-leaf butterfly valve) according to actual conditions to control air volume or installed with an aluminum alloy filter for complementary use. The blades can be horizontally or vertically placed and can be flexibly rotated left or right or up and down to control the air flow direction. Features of single-layer louvered air outlets: adjustable single-layer blades that can achieve different blowing distances and diffusion angles; when used as an air intake, they can be made into an openable structure for use with a filter mesh. They can serve as both supply and return air outlets.