To remove solid smoke particulates, you need a HEPA filter (HEPA removes 99.7% of 0.3-micron particles). For smoke smell, you would need an active carbon filter (adsorbs the smoke gas), the bigger carbon filter the better.

2022年2月25日 · On the MERV (Minimum Efficiency Reporting Value) Rating Chart, HEPA filters rank between 17-20 MERV, the highest levels of efficiency. A MERV 17 HEPA filter is the standard, and anything above is even more efficient at capturing airborne particles.

Em= Average Efficiency Comparisons are approximation given for reference only. Filters should be tested to the most recent standards. For ISO ePM1 and ePM2.5 both initial and dicharged efficiency need to be over 50% to qualify for a class.

2024年9月4日 · Minimum Efficiency Reporting Values, or MERVs, report a filter's ability to capture larger particles between 0.3 and 10 microns (µm). The rating is derived from a test method developed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) [see www.ashrae.org ].

2024年2月25日 · The key specification for HEPA filters is the minimum efficiency they achieve at capturing particles 0.3 microns in diameter. To qualify as true HEPA, filters must remove at least 99.97% of particles this size during testing.

The ISO standard provides a range of filter groups that include EPA, HEPA, and ULPA filters, and defines the minimum filtration efficiency for each group. The table summarizes the different groups along with the commonly used filter classification that each group falls under.

Depending on their design, air filters (bag filters or cartridges) have different degrees of efficiency towards dust particles. This page aims at detailing the different norms for filter efficiency (MERV, ISO) and to help the reader chose the right filter specification depending on the …

EN779 evaluates filters by their synthetic dust capacity and particle removal percentage, classifying them into groups such as G1 to F9. EN1822 focuses on filter efficiency within the 0.08 – 0.15 µm range, providing precise measurements of filter …

2024年2月16日 · For most residential and average office settings, true HEPA filters with efficiency levels around 99.97% provide adequate air purification without overspending on higher classes of filters. However, in specialized industries or critical environments, such as healthcare or electronics manufacturing, the additional cost of H13 or H14 HEPA filters ...

By specifying a HEPA filter's efficiency at 0.3 μm, standards bodies are really describing a variant of the filter's minimum efficiency. A HEPA performance graph, showing the steep drop in efficiency around 0.1 μm.