Defend 400

Best-in-class Solution Providing Medical-grade Air Quality in Healthcare and Commercial Environments


Defend 400

Portable Recirculating Air Cleaning System

The Defend 400 (NV 400) uses WellAir's patented NanoStrike™ technology, combined with a triple-stage Camfil® filter system, to provide a powerful solution for air disinfection and particle removal. 

The Defend 400 is a free-standing, portable recirculating air cleaning system designed for continuous 24/7 protection in healthcare or other commercial settings to provide airborne infection control.


The FDA has cleared the Defend 400 as a Class II Medical Device to filter out and inactivate airborne viruses and bacteria for medical purposes within medium to large rooms and indoor spaces.

The Defend 400 is an FDA Cleared Class II Medical Device.

The Defend 400 inactivates aerosolized viruses, bacteria, and fungi and purifies the air of pollen, particulate matter (PM), volatile organic compounds (VOCs), and odors. Proven to reduce and inactivate:


Learn more about our research and testing.

Commonly used in:
Product Specs
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Product Specifications


33.7" × 15.0" × 15.0"


56.7 lbs

Power Consumption Range:

17W - 179W

Noise Level:

38 - 63 dBA (Speeds 1 - 5)

Fan Airflow Volume:

33 - 210 CFM (Speeds 1 - 5)


Triple Stage: Pre, HEPA, Carbon

Global Certifications:

IEC, UL 867, UL 2998, FDA, FCC, CE

Quality Standards:

ISO 9001

  • How to Purchase

    To buy WellAir products, contact us to find a Representative near you.

    Contact Us

    USA Headquarters
    3540 Toringdon Way, Suite 200 Charlotte, NC  28277
    1 866 508 1118

    Ireland Headquarters
    DCU Innovation Campus
    Old Finglas Road
    Glasnevin, Dublin D11 KXN4
    +353 1 907 2750