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Levoit Core 400S Smart True HEPA Air Purifier

Levoit Core 400S Smart True HEPA Air Purifier is a relatively large, advanced air purifier, suitable for larger rooms or areas, designed for thorough air purification using a multilayered air filtration system, combined with several advanced features including laser dust sensor, WiFi connectivity, VeSync App support, support for Amazon Alexa and Google Assistant, etc.

Despite having many features, Levoit Core 400S Smart True HEPA Air Purifier is nonetheless simple to use and maintain and comes at a rather affordable price for a true HEPA air purifier of this capacity.

Published: April 25, 2022.

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Levoit Core 400S Smart True HEPA Air Purifier Features and Specifications

Levoit Core 400S air purifier features physical dimensions of (L x W x H) 10.8 x 10.8 x 20.5 inches (27.4 x 27.4 x 52 cm) and it weighs 14.12 pounds (~6.4 kg) - it is far from being small and compact air purifier.

The unit should be placed on the floor, in the permanent position at least 15 inches (~38 cm) away from the wall in order to improve the air circulation.

Air intake is at the lower part of the unit (360°) and the air exhaust is at the top of the unit - the unit comes with so-called VortexAir Technology which increases indoor air circulation and filtration efficiency.

Levoit Core 400S is rated at 38W max and features standby power consumption of <2W.

Depending on the air-purifying mode, noise levels range from 24 to 52 dB - unit is very silent, especially in the Sleep Mode, allowing it to operate even during the night in the bedrooms.

Maximum airflow is 260 Cubic Feet per Minute (CFM) or 442 m3/h, allowing the unit to purify the air up to 5x per hour in the 403 sq. ft. (~37.5 m2) room and up to 2x per hour in the 1005 sq. ft (~93.4 m2) room/area.

Additional features include WiFi connectivity with the support for the VeSync smartphone App and support for the voice controls using Amazon Alexa and/or Google Assistant.

Also, the unit comes with:

air quality sensor

- AirSight Plus Technology: Laser Dust Sensor scans surrounding air for airborne particles, allowing the unit to automatically adjust the fan speed in Auto Mode.

- Air Quality Indicator Rings: Indicates real-time air quality as Bad, Moderate, Good, or Very Good, allowing the user to quickly find out the current air condition.

Note: VeSync App allows the user to manage unit's settings, check filter life, receive real-time air quality updates, etc. Although the use of the VeSync App is not mandatory, it is highly recommended.

control panel

Manual controls can be found at the top of the unit and they consist of Fan Speed Indicators, Fan Speed Button, Sleep Mode Button, Air Quality Indicator Rings, Check Filter Indicator Reset Button, Check Filter Indicator, Timer Button, On/Off Button, Wi-Fi Indicator, Auto Mode Button, PM2.5/Timer Display, Display Off Button, Display Lock Indicator and Display Lock Button.

Levoit Core 400S air purifier features four standard fan speeds, including Low, Medium, High, and Turbo. Also, it comes with an additional ultra-quiet Sleep Mode (24 dB).

In Auto Mode, the unit uses an air quality sensor to measure the number of airborne particles and automatically adjust the fan speed.

But, even in Auto Mode unit offers two different modes - Quiet Auto Mode and Efficient Auto Mode.

Quiet Auto Mode uses Medium fan speed as its maximum fan speed - it is optimized for quiet operation, not so much for quick air purifications. On the other hand, Efficient Auto Mode is optimized for fast air purification, regardless of the noise - when air pollution is detected, the unit in Efficient Auto Mode will operate even in High Fan Mode if required.

Air Quality Indicator Rings are lit in different colors, depending on the current detected air quality:

Air Quality Indicator Chart
Indicator Color Air Quality Auto Mode Fan Speed PM 2.5 Range
Blue Very Good Sleep Mode 0-35 μg/m3
Green Good Low 36-75 μg/m3
Orange Moderate Medium 76-115 μg/m3
Red Bad High >115 μg/m3

Note: Levoit Core 400S air purifier is not complicated to use or maintain, but when it arrives, be sure to read the Owner's Guide/Manual in order to get accustomed to your new HEPA air purifier.

Levoit Core 400S Air Filtration System

hepa air filter

Levoit Core 400S air purifier comes with an air filter offering three layers of air filtration:

- Air Pre-Filter is a mechanical air filter that captures larger airborne particles including lint, dust, hair, fiber, pet fur, and similar.

- True HEPA air filter is an H13 True HEPA air filter with so-called HEPASmart Technology and is able to capture 99.99% of bacteria and mold, 99.9% of viruses, and 99.97% of 0.3 microns or larger airborne particles.

- the third layer is a high-efficiency activated carbon filter based on the ARC Formula and is able to capture smoke, fumes, and Volatile Organic Compounds (VOCs), to neutralize pet and cooking smell and other household odors.

The air filter is not washable - it should be replaced on average every 12 months, depending on the unit's use and local air pollution. Also, the air filter should be periodically vacuumed using a gentle/soft dusting brush.

Levoit Core 400S air purifier comes with a 2-year limited warranty.


levoit core 400s mLong Story Short: Levoit Core 400S air purifier is a large, versatile, and very popular true HEPA air purifier.

It can be controlled manually using Control Panel on top of the unit, using the VeSync smartphone App, and using Amazon Alexa or Google Assistant.

Also, it comes with numerous features, including two Auto modes combined with an air quality sensor.

Personally, place it on the permanent location, connect it to the WiFi, set the Quiet Auto Mode, and let the unit do what is it made for - just be sure to periodically check the status either using Control Panel or smartphone App.

For people having smart homes, setting voice control is relatively easy, just be sure to follow the Owner's Guide.

For more reviews and recommendations, feel free to check the Levoit Core 400S Smart True HEPA Air Purifier Amazon link (link opens in the new window).

Amazon Search:

- HEPA Air Purifier

Note: Amazon link opens in the new window, feel free to check it for the most up-to-date offers and prices.





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