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I. Current Situation and Hazards of Indoor Air Pollution
With the acceleration of urbanization and the increased airtightness of buildings, indoor air pollution has become an "invisible killer" threatening human health. According to World Health Organization data, approximately 4.3 million people worldwide die each year from diseases caused by indoor air pollution. Surveys by the China Indoor Environment Monitoring Center indicate that 70%-80% of newly renovated homes in China exceed formaldehyde standards, while PM2.5 and carbon dioxide concentration exceedances are also common.
Indoor air pollution sources primarily include: VOCs (volatile organic compounds) such as formaldehyde and benzene released from building and decorative materials; carbon dioxide and odors generated by human metabolism; cooking fumes; particulate matter like PM2.5 and pollen infiltrating from outdoors; and microbial contaminants such as bacteria and viruses.
II. Working Principles and Technical Advantages of Fresh Air Systems
As specialized equipment for indoor air management, fresh air systems facilitate indoor-outdoor air exchange through mechanical ventilation. Their core functions include:
Ventilation and Air Exchange**: Filtered outdoor fresh air is introduced indoors while stale indoor air is expelled, achieving air replacement. According to ASHRAE standards, each person requires 30 m³ of fresh air per hour, and fresh air systems can precisely control the ventilation volume.
Filtration and Purification**: A multi-stage filtration system is employed, with primary filters intercepting large particles, medium-efficiency filters capturing PM2.5, and high-efficiency HEPA filters achieving 99.97% efficiency in removing 0.3-micron particles. Some high-end models also include activated carbon layers to adsorb gaseous pollutants.
Energy Recovery and Efficiency**: Full heat recovery fresh air systems utilize heat exchange cores to recover thermal energy from exhaust air (with efficiency rates exceeding 70%), reducing energy loss during ventilation while saving 30%-50% energy compared to window ventilation.
Intelligent Control**: Modern fresh air systems integrate sensors for CO2, PM2.5, and TVOC, automatically adjusting operation modes based on air quality. Some systems also support remote control via mobile apps.
