Kun Dan is located in the West Kalimantan Province of Indonesia, situated in the western part of the Kalimantan Island. The city is crossed by the equator, and it has a typical **tropical rainforest climate**. The temperature is high and the humidity is high throughout the year. The air humidity remains above 80% all year round. There is abundant precipitation and mostly convective rain. The city is adjacent to the Kapas River, and the surrounding area is dotted with rivers and surrounded by rainforests. The air contains high levels of moisture, pollen, and microorganisms carried by mosquitoes. Due to the convergence of rivers and the coast, the air also contains a slight amount of water vapor, salt, and soil moisture. Although local buildings often adopt ventilation structures, the high temperature and high humidity climate still make it easy for mold to grow, the air to be stale, and furniture to get damp. The ERV (Energy Recovery Ventilation System) can continuously ventilate and exchange air while efficiently recovering the coldness and humidity in the exhaust air, reducing the energy consumption of air conditioning for dehumidification and cooling. It can also filter out outdoor particles, pollen, and microorganisms through its filtration function, precisely balance the indoor temperature and humidity, and prevent the growth of mold and unpleasant odors. It is crucial for improving the indoor air quality and comfort in various places. The following places are particularly suitable for installing it: 

The various types of residences in Kunshan are the core application scenarios for the ERV system. Whether it is the multi-story apartments in the urban area, the single-family houses by the river, or the modern sealed residences, all can significantly improve the living environment by using the ERV system. The local climate with high temperatures and high humidity throughout the year makes residents rely on air conditioners for cooling and dehumidification all year round. The state of tightly closed doors and windows easily leads to poor indoor air circulation, increased carbon dioxide concentration, and the damp environment will cause mold on the walls, deformation of furniture, and dampness and unpleasant odors in clothes. The pollen brought by the surrounding rainforest may also cause discomfort for people with respiratory sensitivities. The ERV system can continuously introduce filtered fresh outdoor air without opening windows, effectively intercepting pollen, microorganisms, and fine particles in the air, removing the stale air and excess moisture in the room, and recovering the cold energy in the exhaust air, significantly reducing the operating load of the air conditioner, which not only lowers the energy consumption cost for residents but also controls the indoor humidity within an appropriate range, fundamentally preventing mold growth, creating a dry, fresh, and clean living environment for residents. It is particularly suitable for families with the elderly, children, and people with respiratory sensitivities, as well as residences near rivers and rainforests that are prone to moisture and pollen effects. 

As the capital of West Kalimantan Province, Kuantan gathers a large number of government office buildings, enterprise offices, business office buildings, as well as financial and trade institutions. These commercial office buildings have a high density of personnel and usually operate with air conditioning that is closed throughout the day. The indoor air is prone to become dirty due to people's breathing, the heat dissipation of office equipment, and the moisture absorption of paper documents. Excessive carbon dioxide concentration can directly affect the work efficiency of employees. The humid environment may also cause computers, printers, and other office equipment to get damp and short-circuit, and archives and documents to mold and deteriorate. The ERV system can continuously supply filtered fresh air to the office area, diluting harmful gases, odors, and moisture in the room. At the same time, through the energy recovery function, it reduces the energy consumption of the air conditioning needed to maintain indoor temperature and humidity. This not only ensures the health of office personnel and improves work efficiency, but also effectively protects office equipment and file materials from moisture damage, and reduces the operating costs of the building. Whether it is an open office area, an independent office, or a densely populated meeting room, reception area, as well as archives rooms and finance rooms that are sensitive to temperature and humidity, installing the ERV system can demonstrate significant practical value. 

Kundam serves as the medical center of West Kalimantan Province, housing numerous general hospitals, specialized clinics, community health centers, and maternal and child health care institutions. These medical facilities have extremely strict requirements for indoor air quality. They not only need to ensure a continuous supply of fresh air 24 hours a day, but also need to strictly prevent cross-infection of pathogens, while maintaining a stable temperature and humidity environment to facilitate patients' recovery. However, the high humidity climate in the local area can easily cause bacteria and mold to grow in the medical environment, increasing the risk of cross-infection. The humidity may also affect the accuracy of medical equipment. The multi-stage filtration function of the ERV system can effectively intercept pollutants such as pollen, particles, and microorganisms in the outdoor air, providing clean and sterile fresh air to core areas such as wards, operating rooms, examination rooms, and neonatal intensive care units. At the same time, it efficiently expels bacteria, polluted air, and excess moisture from the room, reducing the probability of cross-infection at the source. Its energy recovery feature can also maintain the stability of indoor temperature and humidity while ventilating, avoiding sudden environmental changes that may affect the recovery of patients' conditions. It also provides a healthy, comfortable, and dry working environment for long-term working medical staff, and is an important choice for medical facilities to improve air quality, ensure medical safety, and enhance operational efficiency. 

Tourism is an important industry in Kunshan. Relying on the equatorial scenery, river landscapes and diverse ethnic cultures, the city is home to numerous hotels, guesthouses, resorts and riverside inns. One of the core competencies of these accommodation facilities is to provide tourists with high-quality living experiences. Indoor air quality, humidity control and living comfort are the key factors that directly affect tourists' satisfaction and reputation. The local high-temperature and high-humidity climate, if not well ventilated, is prone to cause problems such as dampness, mold and unpleasant odors in hotel rooms, guesthouse rooms and other areas. This not only affects tourists' living experience but also may corrode indoor furniture and facilities. The ERV system can continuously introduce filtered fresh air to the core areas such as hotel rooms, lobbies, restaurants and leisure areas, intercept pollen, microorganisms and water vapor from outside, and at the same time recover energy to reduce the energy consumption of air conditioning dehumidification and cooling. This not only allows tourists to experience a dry, fresh and odor-free indoor environment during their stay, significantly improving the accommodation experience, but also helps accommodation facilities save operating costs, especially suitable for mid-to-high-end riverside hotels, boutique guesthouses and resorts that focus on equatorial ecological experience. 

The educational institutions in Kunshan, including schools, kindergartens, and vocational colleges, are also important application sites for the ERV system. The areas within schools, such as classrooms, dormitories, and libraries, have a high concentration of people. Students have relatively weaker immunity, and there are more pollen and microorganisms in the local air. The humid environment is also prone to breeding bacteria, which can easily lead to the spread of respiratory diseases and skin diseases. In the hot climate throughout the year, schools usually close their doors and windows and turn on air conditioners, resulting in even more severe problems of poor indoor air circulation. Prolonged exposure to stuffy and humid environments will significantly reduce students' concentration and learning efficiency, and also affect their physical health. The ERV system can continuously provide filtered fresh air to areas such as classrooms, libraries, dormitories, and canteens, diluting the carbon dioxide and bacteria in the rooms, reducing the probability of disease transmission, and filtering pollen and particles from outside to balance the indoor humidity, protecting students' respiratory and skin health. Its energy recovery function can also reduce the energy consumption of the school's air conditioning, alleviate the pressure on operating costs, and create a healthy, comfortable, and dry learning and living environment for students.