HEPA, short for High Efficiency Particulate Air, refers to high-efficiency particulate air filters.
According to the international standard EN 1822-1, HEPA filters are divided into multiple grades based on their filtration efficiency for 0.3μm particulate matter. The 0.3μm size is known as the “Most Penetrating Particle Size” (MPPS)—the particle size with the highest probability of penetrating the filter media. It is neither as easily intercepted as large particles nor as easily adsorbed through Brownian motion as nano-scale particles.
Comparison of filtration efficiency by grade:
H11: filtration efficiency for 0.3μm particles ≥95%
H12: filtration efficiency for 0.3μm particles ≥99.5%
H13: filtration efficiency for 0.3μm particles ≥99.97%
H14: filtration efficiency for 0.3μm particles ≥99.995%
Is a higher grade always better?
Not entirely. The higher the filter grade, the higher the filtration efficiency—but also the greater the air resistance. Greater air resistance means a more powerful motor is needed to maintain airflow, and power consumption and noise increase accordingly. This is a triangular relationship that needs to be balanced: efficiency, airflow, and noise.
Therefore, filter selection for an air purifier should be determined according to the type and concentration of pollutants in the target scenario, rather than simply stacking up higher grades.
Why does the Y series choose H13?
For commercial scenarios such as chess and card rooms, building material showrooms, and factory workshops, the air simultaneously contains complex pollutants such as high concentrations of PM2.5, smoke aerosols, and bacterial clusters. The H13 grade’s 99.97% filtration efficiency for 0.3μm particles means it can intercept virtually all fine particles that might penetrate the filter, while still ensuring a circulating airflow output of over 1200m³/h within a reasonable air resistance range.
In addition, we chose to build the filter to 7000g—two to three times heavier than most commercial filters on the market. Greater weight means denser filter paper pleating, a larger unfolded area, and stronger dust-holding capacity, thereby maintaining filtration efficiency close to its initial state over a longer period of time.
