The DHI product is the "heat recover ventilator". The venting of air
conditioner and the new air coming into the room should first enter into this equipment.
The venting air and new air do the heat exchanger. Use the energy of venting
to pretreat the new air. In summer and winter, the new air can get the cooling
and drying or warming and wetting processing so as to do the energy cycling
to ensure the circulation of fresh air in the room and effectively recycle the
energy.