When PTC heater starts working, the efficient heat exchanger in the equipment is used to achieve rapid heating of the air. The large wind pressure axial fan installed on the top is used to forcedly press the hot air down. Then the air is subject to pressure boost twice through the silencer sponge and the lower trapezoidal convergence, swirls out from the nozzle through the guide vane and is distributed throughout the space from top to down.
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