A Higher Filter Grade Is Not Always Better

For example, an H12 filter removes more than 99.5% of PM2.5, while an H13 filter removes more than 99.95%.

How much are you willing to sacrifice for that small difference? Is 99.5% really insufficient? Do you truly need surgical-room cleanliness at home? For ordinary living environments such as homes, H13 or H14 filtration is unnecessary. Moreover, regardless of how high a HEPA filter's grade is, it cannot remove harmful gases or odors. The manufacturer of Tion fresh-air systems states that the most complete filter combination for a residential fresh-air system is a prefilter, a large-area H11 or H12 HEPA filter, and a high-capacity activated-carbon filter. This combination can create a healthy indoor environment without wasting consumables.