Air classifier is a particle separation device that uses air flow to classify particles based on their size, shape, and density. It works by introducing a stream of air into a chamber containing the particles to be classified. The air flow causes the lighter and smaller particles to be carried away, while the heavier and larger particles settle downwards. The classified particles are then collected and removed from the system. Air classifiers are commonly used in industries such as mining, ceramics, pharmaceuticals, and food processing to separate particles and produce materials with specific properties. They offer advantages such as high precision, low maintenance, and low energy consumption.