The gas filter is comprised of activated carbon – the industry standard for gas filtration. The particle filter wraps around the outside of the cylindrical filter while the gas filter wraps around the inside. The 411 features a single combination particle and gas filter. Gas FilterĪ close-up of the carbon filter that wraps around the inside of the unit's particle filter. Thus, if your goal is as low of room particle concentration as is possible you not only require proper filtration, but also sufficiently high CFM, and the higher the CFM the better (more on this in just a moment). Higher output units like the 250 CFM Coway Mighty and Winix 5500-2 were able to get to 100 particles per cubic ft. the same output (around 100, 120 CFM), could not lower particle concentration in the room much past 500 or 600 particles per cubic foot. Still, it is of note that the 411 at least provides similar filtration speed to HEPA equipped units (with similar output) for removing household dust.Īlso of note is the fact that the 411, like other units at approx. We primarily tested for the removal of household dust particles.Ī more complete more precise test would show the theoretical improvement of going from the 411’s proprietary filter to a HEPA filter much better. Our testing also did not include a wide variety of particles (smoke, pollen, pet allergens, etc.) with a wide variety of size distributions. Our testing was limited to measuring concentration for particles 0.5 microns and larger. The answer has to do with the limitations of our tests. Why did it perform just as well and sometimes even better than HEPA equipped units (at similar output) in our testing? Theoretically, the 411 is equipped with an inferior particle filter. Thus, the 411’s lack of a true HEPA filter is a strong negative for this unit. The bottom line? The 411’s particle filter is highly efficient but a HEPA filter is substantially more efficient. This demonstrates a much more substantial difference in filter efficiency than what a small percentage difference would at first appear to indicate. A HEPA filter’s 99.97% efficiency means that for every 10 million particles that travel through it, only 3,000 make it through. So, back to the percentages we gave earlier: the 411 particle filter’s efficiency is 99% which means that for every 10 million particles that travel through the filter, 100,000 make it through. This means that even if you’re in a fairly small room with fairly low particle concentration there’s still at least 10 million particles in the air in the room you’re sitting in right now. Now multiply the minimum likely concentration of particles in the room by the minimum volume of air in the room: 10,000 particles per cubic foot multiplied by 1,000 cubic feet = 10 million particles. This is how much air is in a 10 x 10 ft room with 10 ft ceilings. Second, the room you’re sitting in right now likely contains at least 1,000 cubic feet of air. ![]() In other words, particle concentration in the average room is usually in the 1,000s, if not the 10,000s of particles per cubic foot. ![]() This may not sound like much but consider this:įirst of all, if you’re sitting in a room without an air purifier right now, it’s likely the room air contains at least 10,000 particles per cubic foot. There’s only a 0.97% difference between the 411’s particle filter’s efficiency and a HEPA filter’s efficiency (99.97 – 99 = 0.97). Plastic rings that keep the filter properly in place are removed in this photo. ![]() A HEPA filter removes 99.97% of particles 0.3 microns and larger. The industry standard for particle filtration (mold, pollen, dust, etc.) is a HEPA filter. The manufacturer claims that this filter is able to remove up to 99% of pollutants that travel through it. The 411 is equipped with a proprietary particle filter. given an additional 40 minutes and an additional 27 minutes, respectively. and the HPA100 was able to achieve 900 particles per cubic ft. This result was also similar to HEPA equipped units at the same output – the AC4825 was able to achieve 500 particles per cubic ft. The GermGuardian AC4825 and Honeywell HPA100 accomplished the same feat in 23 minutes and 22 minutes respectively.Īfter 11 additional minutes the 411 was able to achieve as low of a room concentration as was possible for this unit – 600 particles per cubic ft. in 18 minutes – a very similar time to HEPA equipped units with similar output. test environment the Blue Pure 411 with its proprietary particle filter (non-HEPA) and 120 CFM of air processing power was able to lower particle concentration in the room from 10,000 particles per cubic ft. Air Processing Performance 1 Test Results
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