Poor air quality can be attributed to many problems arising in room.It is believed to contribute to a significant loss in productivity, low morale and higher rates of sickness amongst many people. The object of providing good ventilation alongside air conditioning in residential and commercial buildings is to provide conditions under which people can live and work in comfort and safety. The Alto Energy Recovery Ventilator(ERV) not only provides a comfortable, healthy, noise-free, and safe means of exchanging stale, polluted indoor air with fresh outdoor air, but also save a lot of energy of air conditioning for the fresh air.