Answer: The soundproof cover not only eliminates noise during the operation of the air compressor, but also facilitates ventilation and heat dissipation due to its special structure. When the air compressor is running, the soundproof cover is closed, and the air intake of the cooling fan can enter from the vents reserved at the bottom of the soundproof cover. These vents face the main engine, motor, oil and gas tanks of the air compressor, which can effectively reduce the temperature of the corresponding positions and improve the operating stability of the motor. Therefore, the soundproof cover should not be opened during operation.