Thursday, September 22, 2016

What is wrong with Mi Air Purifier 2?

Due to rising pollution in India people are daily becoming aware of the pollution and looking for ways to get clean air. Delhi is worse hit city and with rising Air Quality Index (AQI).  This is the reason for high demand for Air Purifiers. It is expected that Air Purifiers industry is going to be high growth industry.  

At right time Xiaomi launched Mi Air Purifier 2 in India officially and the price is Rs. 9,999. This MI Air Purifier 2 got much hype because of its IOT enabled smart APP and the product is hailed as Smart Air Purifier. In fact the brand has succeeded to generate enough hype around it and they are offering the product at reasonable rate.

Mi Air Purifier 2 is very speedy in removal

In fact the Mi Air Purifier 2 has its product page with detailed spec overview. Nevertheless to say the page is beautiful. The specs also looks promising.  Mi Air Purifier 2 is compact and have 310 CADR rating.  Clean Air Delivery Rate (CADR) is a figure of merit that is the cubic feet per minute (CFM) of air that has had all the particles of a given size distribution removed.

Mi Air Purifier 2 is very smart indeed

You can use your phone as a remote to power on,  power off, and switch modes. The Mi Home app  also lets you monitor home air quality from your phone at any time. Create schedules to power on, power off, switch to Night mode, and more. The devise is intelligent enough to know the filters needs replacement and can alert you the same on the App as well.  The App display the air quality as well.

The purifier page says it is very quite but decibel level information is completely missing so really we cannot say about it.  Mi Air Purifier 2 consume 4.8 Watts making it very energy efficient air purifier.

Then what is wrong with  Mi Air Purifier 2

Well it looks awesome and smart but will it really clean the Air? What is the heart of Air Purifier - the answer is its Air Filter. It has the ability to clean or purify the Air.  Better the filter then better the air quality. Then what is the best standard for filter? The name is HEPA or True HEPA. HEPA filters are considered as efficient in cleaning and consider industry standard and best for Asthma patients. Mi Air Purifier 2  do not have HEPA filter which is industry standard.  It has high-density EPA filter but not HEPA filter. Generally true filter is expensive and HEPA air purifiers price starts from Rs. 15,000.

What exactly is HEPA?

High-efficiency particulate arrestance (HEPA),  also sometimes called high-efficiency particulate arresting or high-efficiency particulate air, is a type of air filter. Filters meeting the HEPA standard have many applications, including use in medical facilities, automobiles, aircraft and homes. The filter must satisfy certain standards of efficiency such as those set by the United States Department of Energy (DOE). To qualify as HEPA by US government standards, an air filter must remove (from the air that passes through) 99.97% of particles that have a size of 0.3 ┬Ám.

Products that claim to be "HEPA-type", "HEPA-like", "HEPA-style" or "99% HEPA" do not satisfy these requirements and may not have been tested in independent laboratories. Some of these sub-par quality filters may come reasonably close to HEPA filtration, while others will fall significantly short, making them truly inferior.  Read more at Wikipedia

As mentioned above 99.97% of particles that have a size of 0.3 micron  should be removed to be HEPA. Xiomi Mi Air Purifier argues that it can remove 0.4 micron particles but what percentage? It will be complete inefficient air purification if it is able to remove only 95% of pollutants. Even the purifier filter page does not have any information about this.

We hope that in the next version Mi Air Purifier 3 they will incorporate HEPA filter even it is little pricey but fixing the essential heart of the air purifier.  You can try using out smart air purifier selection tool and can easily select best air purifier for your home.


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