Housewell counterflow energy recovery fresh air ventilator adopts European the most advanced technology by VM whole energy recovery module. Compared to other products ,same unit volume increased heat-exchange area 16%, 11% heat exchange efficiency. Housewell original polymer nano heat moisture permeable membrane has a high thermal conductivity, high gas-tight security, and has antibacterial disinfectant. Housewell counterflow energy recovery fresh air ventilator used in a variety of air-conditioned rooms, offices, laboratories, leisure centers, coffee shops, theaters and so on.