What is the difference between hepa and hepa type filters

But there are exceptions to the rule. The Holmes desktop air purifier I showed earlier is an example I can use. However, in this case, Holmes does specify it can trap contaminants down to 2 microns 2uM in size. For example, for larger particles like dust mites, household dust, hair, and so forth it can work just fine. As I mentioned earlier, because of clever marketing you could be misled into thinking HEPA-type purifiers are just as good as the real thing.

Speaking of money — got a budget? Hi Jacqueline. Hello, Adolfo. Hi there Carl. HEPA-type vs. Are there exceptions? Your comments are welcome! This can also be the case for air purifiers. Therefore, please check with the manufacturer if you can upgrade your filters to higher MERV without loss of performance.

Unfortunately, the data is not clear on the size of particles that a HEPA filter can and cannot remove. This is likely the case because almost all particles will get stuck sometimes.

Additionally, the measurement of such small particles is rather difficult. However, the following graph shows the efficiency of HEPA filters per particle diameter the x-axis has a logarithmic scale. You can clearly see a dip around 0. And the graph stops at 0. This likely indicates that there is no data on particles smaller than 0. And probably that the removal efficiency drops for particles smaller than 0.

There are some differences between HEPA filters. However, every HEPA filter has the same For particles that are smaller or larger, HEPA filters can vary in efficiency, but will always be higher than However, all of them are at least HEPA, and these small differences are not relevant for home use.

They can be a factor in HEPA filters used in hospitals or certain professions. ULPA filters remove So when a HEPA filter lets 3 particles escape per ULPA filters are not generally available as part of an air purifier. What exactly is HEPA? Are there different types? What are the differences?

It is a standard defined and developed by the U. Department of Energy during the s as part of their efforts to contain the spread of particles and contamination resulting from nuclear testing. This standard has since moved into the consumer market and has become commonplace for air purifiers. To meet the HEPA standard, the filter must remove In other words, for every 10, particles that are 0. The HEPA standard traps very small particles, many of which are invisible to the human eye and harmful to your health.