The mineral electromagnetic heat air unit converts three-phase AC power into DC voltage, then utilizes frequency conversion to output a high-frequency AC of 10KHz-35KHz. This generates a magnetic field through coils wrapped around the iron tube, causing eddy currents in the tube's arm for heating. An axial flow fan then passes cool air over the inner wall of the tube for heat exchange, producing hot air. By controlling the frequency of the alternating magnetic field, the amount of heat generated in the iron tube is regulated, thereby controlling the temperature of the hot air output (35℃-85℃).