Xiaomi Air Purifier 4 Review

Xiaomi is a well-known brand in the electronics industry, and it has made a significant impact in the air purifier market. We recently conducted a test on the Xiaomi Air Purifier 4 model, and the results were quite astonishing. In just 12 minutes, this device can efficiently purify the air in a room of up to 20 square meters. While it may have some limitations in terms of manual features, it’s not a major drawback. Now, let’s delve into our exploration of the Xiaomi Air Purifier 4.

Why Can You Trust Our Review?

First and foremost, we have to say that Beforebuy’s review aims to commit to thoroughness and transparency, and our review of the Xiaomi Air Purifier 4 is no exception. Here’s why you can trust our reviews:

First, we don’t just rely on specifications and data sheets. We are excited about the Xiaomi Air Purifier 4 experience. Over a period of three months, our team deployed this air purifier in a variety of environments — from bustling city apartments to urban pollution to peaceful rural homes surrounded by nature. Through this detailed testing, we are able to understand the Xiaomi Air Purifier 4’s performance under various environmental conditions.

Our assessment is based on data and observations derived from a meticulously designed testing regimen. We used industry-standard methods such as measuring CADR, testing filter performance, and real-world stress testing. Furthermore, we consider deeply the user experience aspects, scrutinizing the product’s ease of use, app integration, and noise level, among other aspects.

In our first-hand experience, our review process goes beyond testing individual products. Thus, we compared the Xiaomi Air Purifier 4 with other leading models on the market, analyzing its strengths and weaknesses in a broader context. Furthermore, to ensure an objective and rigorous comparison, we invited a team of independent experts specializing in equipment testing and indoor air quality.

Our Analysis and Testing Results

As mentioned above, we thoroughly examined the Xiaomi Air Purifier 4, using objective evaluations and conducting hands-on testing. Here are our detailed findings.

Expert assessments

Our indoor air quality experts closely tested the Xiaomi Air Purifier 4. They found this air purifier is best suited for small spaces from 28 square meters to 48  square meters, such as bedrooms, kitchens,… It is effective against pollution in cities and near industries. Of course, with such a filtering range, the Xiaomi Air Purifier 4 is absolutely not ideal for large spaces.

Xiaomi Air Purifier 4 has outstanding features. For example, its advanced sensors accurately report air quality in real-time. It operates quietly, even in high settings. Furthermore, it is compatible with many smart home systems, highlighting its modern design. Therefore, the Xiaomi Air Purifier 4 can be easily integrated into the home system.

Although the Xiaomi air purifier 4 has many exciting things, there are still aspects that need further improvement. Its mobile app, while detailed, can be confusing to those new to technology. Making the app more intuitive or adding a simple tutorial can enhance user-friendliness.

Product specifications

We’ve meticulously analyzed the Xiaomi Air Purifier 4 and compiled its specifications into an organized table for easy reference:

Key features

Let’s dive into these unique properties of the Xiaomi Air Purifier 4:

Air cleaning performance/ CADR

According to the brand’s announcement, the Xiaomi Air Purifier 4 has a Particulate CADR (Clean Air Delivery Rate) of up to 400m³/h1, meaning it can deliver 6660L of purified air per minute. So what about reality? We tested the cleaning ability of this air purifier in an approximately 20-square-meter room. As a result, it cleaned the room’s air in just 10 minutes. Thus, although the results given by Xiaomi are not completely accurate, there is not much difference from reality.

Besides, to help you easily evaluate the air performance of this air purifier. We put it on the scale to compare with similar products so you can see how high it is:

As you can see, the Xiaomi Air Purifier 4 has a CADR of 400 CFM, which is in the middle of other air purifiers on this list. 

According to our observations and research, this good air performance is the result of a 3-layer filtration system. Initially, the pre-filter will capture larger airborne debris, such as hair and dust. Then, steps in, Xiaomi’s High Efficiency Filter meticulously removing 99.97% of microscopic particles, even those as small as 0.3 microns. Finally, completing this comprehensive system is an activated carbon filter, which effectively neutralizes odors and harmful gases.

Whisper-quiet operations

 In terms of noise level, Xiaomi Air Purifier 4 is also very commendable. We found that even at the highest fan speed, the noise level was still at an acceptable level of only about 63dB, equivalent to normal conversation. At night, you can automatically adjust the noise level to about 32.1dB. As for us, we can enjoy a good night’s sleep without distractions. Take a look at the chart below to see how well the Xiaomi Air Purfier 4 handles noise compared to other air purifiers in its price segment:

Intuitive smart controls

The next important feature that we appreciate about the Xiaomi Air Purifier 4 is the original smart control. Intuitive smart control powers Xiaomi Air Purifier 4 and integrates seamlessly with multiple smart home systems via the Mi Home app (Mi home app Google Play). Therefore, you can use voice commands through Google and Alexa virtual assistants. Or adjust settings remotely with your smartphone, to control this device.

Advanced air quality monitoring

Xiaomi Air Purifier 4 continues to surprise us with its advanced air quality monitoring feature. This feature uses advanced sensor technology, providing users with real-time insights into their home environment. Monitor air quality directly on the OLED screen through the following 4 colors:

• Green: Clean, fresh air.
• Yellow: Low air pollution levels.
• Orange: Moderate air pollution level.
• Red: The air is extremely polluted

In addition, this OLED screen also displays PM 2.5 concentration, humidity, and temperature. Not only that, the device is also connected to WiFi and other functions.

Filter longevity and replacement alerts

The last key feature continues to be a testament to the modernity of Xiaomi Air Purifier 4, which is the purifier’s Replacement Warning and Filter Life. When replacement time approaches is coming, a built-in alert system, both on the device and via the mobile app, will ensure you stay up to date.

Ongoing cost for Xiaomi Air Purifier 4

The Xiaomi Air Purifier 4, while being a high-quality product, does come with its ongoing costs, which we’ll break down in detail. Understanding these costs can help prospective buyers make an informed decision.

Operating/Electrical cost

Xiaomi Air Purifier 4 costs about 179.98 USD. However, prices may vary by region and retailer. Xiaomi Air Purifier 4 has an average power consumption of 30W, even at maximum power. Assuming the cost of electricity is 0.15 USD/kWh and letting it run continuously without turning it off, the annual electricity cost will be about 39.42 USD.

Compared to other outstanding products on the air purifier market, Xiaomi Air Purifier 4’s electricity cost is not too high, as you can see in the chart below:

Filter cost

Regarding the filter cost, the Xiaomi Air Purifier 4 filter needs to be replaced every 6–12 months. Replacement costs range from $39.99. This means annual filter costs range from $29.90 to $79.98. Considering this annual cost, the total filter replacement cost over three years will range from approximately $119.97 to $239.94

Final Thought

In short, we evaluate Xiaomi Air Purifier 4 is an edge-cutting and affordable air purifier. Its sophisticated filtration, smart home integration and silent operation are particularly impressive. However, you should be aware of filter replacement costs and ensure they are comfortable with the application involved. Overall, for its price, we believe this air purifier offers a great combination of functionality and reliability.