CURRENT AND RECENT TREND OF HVAC FILTERS FOR INDOOR AIR QUALITY

摘要

After 9/11, awareness of air filtration systems to protect building environments for commercial/industrial and residential HVAC (heating, ventilating and air-conditioning) units has substantially been increased. Indoor Air Quality (IAQ) is becoming a dominant concern for human health effect. People spend most of their time indoors. Indoor pollutant levels are generally two to five times higher than the outdoor's. As the EPA pointed out the importance of human health effect associated with environment, Indoor Air Quality (IAQ) is a dominant concern for us. Allergens affect more than halfthe population in the world. Following the implementation of the PM2.5 standards along with PM10, people pay more attention to the fine particles. There is a strong correlation between the level of particles in outdoor ambient air with the level found in the indoor environment. Since there are much more particles indoors than in the ambient, an effective filtration system is needed to remove these particles.Although the forced air ventilation residential filters are very unique to North America, these forced air ventilation systems have been increasingly utilized in commercial and industrial buildings all over the world. Due to the mechanical limitation of air circulating blowers, the pressure drop of these filters is a very critical factor. This paper included current HVAC filters and recent trend of HVAC filters.