Innovation in Air Disinfection


Defend 400 - FDA Cleared Checkmark

The Defend 400 is an FDA-cleared medical device that inactivates aerosolized viruses, bacteria, and fungi, and purifies the air of particulate matter (PM), volatile organic compounds (VOCs), gases, and odors.  The device is designed for airborne infection control in small to medium-sized rooms where the risk of infection is elevated.  The Defend 400 device combines NanoStrike™ Technology with a triple-stage filtration system from Camfil® to deliver healthy indoor air.

The Defend 400 is UL 2998 and CARB validated for zero ozone and UL 867 safety certified.

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NanoStrike™ Technology

NanoStrike™ Technology rapidly inactivates airborne contaminants to help ensure they are no longer a threat of infection.

Triple stage filter

Medical-grade filters capture debris, small particles, VOCs, gases & odors

Antimicrobial finishes

Antimicrobial paintwork reduces the need for regular cleaning

No emissions or harmful by-products

Medical-grade components generate no emissions and no harmful by-products

NanoStrike + Medical-Grade Filtration = Unrivaled Performance


Traps particulates 1,000um -> 100 um which cause allergies, asthma, sneezing, itching and watery eyes


Inactivates viruses, bacteria & mold 10um -> 1um which cause infection, respiratory issues and short + long-term illnesses


Neutralizes VOCs, odors and gases 0.1um -> 0.01um which case headaches, fatigue, dizziness, nausea, burning and itching eyes

Clean air

Delivers healthy, contaminant-free air making the indoor world cleaner and safer

Help reduce the threats associated with dirty, sick, and toxic air

Indoor air can be up to five times more polluted than outside air – teeming with viruses, bacteria, fungal spores, volatile organic compounds, particulate and allergens. Exposure to these pollutants can lead to many virus-based illnesses, bacterial infections, asthma, allergies and a host of long-term health issues.

This is why the Defend 400 was designed to clean the air via a four-stage air disinfection and purification process, inactivating and reducing a wide range of pollutants and pathogens.

How NanoStrike protects

WellAir's patented NanoStrike Technology

Patented Technology

Harnesses multiple concurrent pathogen inactivation processes in one powerful strike

NanoStrike inactivates at the DNA level.

Inactivates at the DNA level

Effective down to molecules as small as 1nm

NanoStrike inactivates in a sub-second.

Inactivates in a Sub-Second Time Frame

Significantly faster than all other inactivation technologies

NanoStrike bursts the pathogen cell.

Uniquely Bursts the Pathogen Cell

Prevents self-healing, ensuring cell does not become viable as an infectious agent once again

Bursting the cell, NanoStrike allows no possibility for antimicrobial resistence.

No Opportunity for Antimicrobial Resistance

Multiple pathogen inactivation processes guarantee no future antimicrobial resistance can develop

NanoStrike is powerful yet gentle enough for 24/7 use.

Powerful Yet Gentle

Powerful yet gentle for 24/7 use around the most vulnerable of people

Novaerus products offer low cost of ownership.

Leader in Lowest Cost of Ownership

Utilizes ultra-low energy with no installation, maintenance or replacement components

Best in class operational performance.

Best-in-Class Operational Performance

Provides consistent out-of-box performance throughout entire operational life and can be used in a variety of small to large product form factors

WellAir products are independently tested and proven.

Independently Tested and Proven

Tested and proven effective at inactivating the smallest of airborne viruses, bacteria and mold spores

Our Technology

WellAir technology explained

Used in the Defend 400 and Defend 1050, NanoStrike has been independently tested and proven effective at inactivating the smallest of airborne viruses, bacteria, mold spores, and pollen. Watch our videos to learn more about the Defend 400, 1050, NanoStrike Technology and our TRUE HEPA filtration.

WellAir's Defend 400

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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