Air nozzle, oven, and coating system

An air nozzle, comprising:

• a housing;
• and
• an airflow regulator;
• wherein the housing comprises a target air outlet, two side plates, and two end plates, the two end plates are respectively located at two ends of the two side plates, the two end plates are both connected to the two side plates, and for each of the side plates, two ends of a side plate are connected to different end plates;
• wherein the two side plates are each provided with multiple air inlets, an air flow enters the housing through the air inlets and leaves the housing through the target air outlet;
• wherein the airflow regulator is located at the target air outlet and capable of moving between a first position and a second position;
• wherein the airflow regulator exerts a greater resistance against the air flow in the first position than the airflow regulator exerts against the air flow in the second position;
• and
• wherein for each of the side plates, along an arrangement direction of the two end plates, the number of air inlets in a middle part of the side plate is larger than the number of air inlets at either end of the side plate.