What is the CADR rating of the Levoit Core 400S?

The Levoit Core 400S has a CADR of 410 CFM (approximately 697 m³/h), making it suitable for rooms up to 403 sq ft (37 m²) with four air changes per hour.

How loud is the Levoit Core 400S on sleep mode?

Sleep mode runs at approximately 24 dB — whisper-quiet and barely audible in a silent room, making the Core 400S ideal for bedrooms and nurseries.

How often do Levoit Core 400S filters need to be replaced?

The 3-in-1 composite filter should be replaced every 6–8 months under standard use, or every 3–4 months in heavily polluted environments or during bushfire season.

Is the Levoit Core 400S compatible with Amazon Alexa or Google Assistant?

Yes. The Core 400S pairs with the Vesync app, which supports Amazon Alexa and Google Assistant for voice control and remote monitoring from anywhere.

What is the annual running cost of the Levoit Core 400S?

Estimated annual running cost is approximately $103 USD / $157 AUD — roughly $20 in electricity and $137 in filter replacements per year.

Does the Levoit Core 400S produce ozone?

No. The Core 400S uses purely mechanical HEPA filtration with no ioniser or ozone-producing technology. It is certified ozone-free.

What is VortexAir technology in the Levoit Core 400S?

VortexAir is Levoit's proprietary air circulation system that claims to deliver 360-degree intake and enhanced airflow across the full room. The Core 400S draws air from all sides and exhales purified air upward through the top grille.

Does the Levoit Core 400S have a PM2.5 sensor?

Yes. The Core 400S includes a built-in laser particle sensor that displays real-time PM2.5 readings on the front LCD panel and drives the auto mode fan speed response.

Levoit Core 400S Review (2026): Tested and Rated

At a glance — the Levoit Core 400S delivers 410 CFM CADR, whisper-quiet 24 dB sleep mode, real-time PM2.5 monitoring, and Vesync app control for ~$229 USD. After six weeks of testing in an Australian home with a gas cooktop and pets, here is our full verdict.

The Levoit Core 400S is one of the most capable mid-range air purifiers available in 2026. After six weeks of continuous testing in a real Australian home, it is easy to see why it consistently tops best-of lists. This review covers everything you need to know before you buy: CADR performance data, real-world noise measurements, filter replacement costs, smart features, and full head-to-head comparisons with the Levoit Core 300, Coway AP-1512HH, and Winix 5500.

Last updated: April 2026