Defend 400

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 odours. 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.

nanostrike technology
triple stage filter
fan speed control
medium rooms
  • Commercial/Office buildings
  • Childcare & Schools
  • Retail
  • Gyms
  • Restaurants/Bars
  • Theatres/Sporting Venues
  • Operating Theatres
  • Intensive Care Units
  • Emergency Rooms
  • Patient Wards
  • Dental Clinics
  • Blood Banks 
  • In Vitro Fertilization Labs
  • Senior Living Facilities
Product Specs

Defend 400 | Air Cleaning Device

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 cleaning process, inactivating and reducing a wide range of pollutants and pathogens.

Download Brochure
NanoStrike™ Technology rapidly inactivates airborne contaminants to help ensure they are no longer a threat of infection.
Medical-grade filters capture debris, small particles, VOCs, gases & odors
Antimicrobial paintwork reduces the need for regular cleaning
Medical-grade components generate no emissions and no harmful by-products

Why Indoor Air Matters

Humans spend between 80–95% of their lives inside inhaling more than 10 m3 of indoor air every day.

Pollutants and pathogens suspended in that air can be absorbed into our throats, eyes, lungs and bloodstream, negatively impacting our health, wellbeing, cognition, and performance.

Independently Tested and Proven

The Defend 400 achieved a net LOG reduction of MS2 bacteriophage virus, a surrogate for SARS-CoV-2 after 45 minutes of 5.31 which is equivalent to a net percent reduction of 99.9995%.  

Nanostrike Technology

The First Line of Protection Against Airborne Viruses and Bacteria

Developed by the WellAir team of scientists and engineers, NanoStrike technology harnesses a range of physical concurrent pathogen inactivation process to safely dis-infect the air. NanoStrike coils provide a powerful strike that works to burst airborne pathogen cells, rapidly inactivating them, ensuring they are no longer a threat of infection. 

Contact Us To Learn More

Defend 400


  • A brief conversation about your indoor environment
  • Overview of our unique NanoStrike technology and products that best align with your requirements
  • All your questions answered to make sure you have the information you need

    Subscribe to our newsletter

    Get news and updates about our latest products and offerings