Low-noise surface-mounted cabinet type fresh air ventilator

The utility model discloses a low-noise surface-mounted cabinet type fresh air fan which comprises a shell, a fresh air fan body, a return air fan body, a heat exchanger and a high-efficiency filter. A fresh air inlet, a return air inlet, a fresh air outlet and a return air outlet are formed in the shell; the fresh air fan is arranged between the fresh air inlet and the heat exchanger, the return air fan is arranged between the heat exchanger and the return air outlet, the windward side of the return air fan is opposite to the return air inlet, and the efficient filter is arranged between the heat exchanger and the fresh air outlet. According to the surface-mounted cabinet type fresh air ventilator, the fresh air fan is arranged at the front end of the heat exchanger, and the high-efficiency filter is arranged at the rear end of the heat exchanger, so that fresh air is subjected to sound absorption through equipment such as the heat exchanger and the high-efficiency filter, the fresh air has a sound attenuati