The double-layer louver tuyere has two layers of movable blades which can adjust the Angle. The short blade is used to adjust the diffusion Angle of the air supply, and can also be used to change the direction of the air flow. The adjustment of the long blade can make the air supply stick to the ceiling or tilt down at a certain Angle (when sending warm air). The outer blade of the double-louvered tuyere or the blade of the single-louvered tuyere can be parallel to the long side or the short side, which can be selected according to the requirements of the customer.