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Does the purifier often have a HEPA net removal rate of 99.9

文章出處:九言科技 人氣:發表時間:2019-03
Not included. HEPA network is also called high-efficiency particle filter (US-level DOE-STD-3025-2007 is a 0.3 micron removal rate of 99.97% for HEPA network), important for particles above 0.3 microns, not for formaldehyde, benzene, ammonia, etc. Gas, because the molecular diameter of these toxic gases is much less than 0.3 microns, the HEPA network is basically helpless to remove, the clean air input rate (CADR value) based on the HEPA network or the size of the recirculation air volume does not represent the ability to remove formaldehyde. The ability to remove toxic gases such as formaldehyde depends on the size of the formaldehyde, physical characteristics, activated carbon quality, indoor humidity, and purifier layout to select an air purifier instead of a clean air input rate (CADR value). In the market, the measurement of air quality by hand-held instruments is only to measure the number of particles. The particle counter adopts the laser to sense the imaging count, and counts dozens of micron particles in the air. The scale of the HEPA net itself adopts the PSL scale particle test. It is possible to filter particles larger than 0.3 microns, and the hand-held particle counter can simply determine the consequences of the HEPA network. However, because the diameter of the toxic gas molecules that can enter the human respiratory system and enter the blood is small, the particle counter is helpless to measure the concentration of toxic gases, so it is also unreasonable to determine the level of decoration purification. The formaldehyde has a diameter of 0.00045 micron and toluene is 0.0006 micron. These toxic gases are 1000 times smaller than the particle counter to detect the fine diameter of the particles. To determine the level of toxic gas purification in a newly renovated house, a suitable method is to use a gas chromatograph to detect it through a local health department or a third-party certified testing agency.