Cold Plasma / Non-Thermal Plasma (NTP) Air Purification System
Helps reduce airborne microorganisms, VOCs and odours.
Supports LEED · WELL · ESG
— Technology —
Cold Plasma / Non-Thermal Plasma (NTP)
Cold Plasma, or Non-Thermal Plasma (NTP), is a process that uses low-energy electrical current to activate oxygen and nitrogen molecules in the air, converting them into Reactive Oxygen and Nitrogen Species (RONS) — reactive species that can damage the cell membranes of microorganisms, break down VOCs and rapidly decompose odour molecules.
This process operates 24 hours a day at room temperature without generating heat or leaving chemical residues, and is designed to be safe for people while the system is in operation.
Operates 24/7 in Occupied Spaces
Unlike UV-C systems that require restricted access — NTP can operate continuously under normal occupied conditions.
— Solution —
2 System Options
Choose the system that best suits your space
In-Duct NTP System
Installed in existing air ducts to provide simultaneous coverage across all areas
Details: The In-Duct NTP system is installed inside the ductwork of the building's AHU (Air Handling Unit) or FCU (Fan Coil Unit), continuously purifying the air passing through every duct and covering all rooms in the building without requiring separate equipment for each room
Suitable for: 🏢 Offices and Buildings · 🏨 Hotels · 🏥 Hospitals · 🏫 Schools and Universities · 🏭 Food Factories (GMP/HACCP)
Stand-Alone NTP Unit
Plug & Play — Easy to Install, Ready to Use Immediately
Details: Stand-Alone NTP is a floor-standing or wall-mounted air purification unit designed for areas that require particularly high air quality or areas not covered by the duct system. No technician installation is required, and it is ready to use immediately
Suitable for: 🐾 Pet Hotel / Cat Cafe · 👴 Senior Care / Care Home · 🏥 Clinic / Examination Room · 🏠 Residence · ☕ Café / Coworking Space
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Cold Plasma NTP vs Other Technologies
Why Choose Cold Plasma NTP?
| Feature | Cold Plasma NTP | HEPA Filter | UV-C | Conventional Air Purifier |
|---|---|---|---|---|
| Virus / Bacteria Reduction | ✅ 99.9% | ✅ Captures (does not kill) | ⚠️ Only where exposed to light | ⚠️ Limited |
| Odour Removal (Molecular Level) | ✅ Permanently breaks down odours | ❌ | ❌ | ⚠️ Temporarily masks odours |
| VOC Removal | ✅ Breaks down molecules | ❌ | ⚠️ | ❌ |
| Safe for Occupied Spaces 24/7 | ✅ | ✅ | ⚠️ Area must be closed off | ✅ |
| No Frequent Filter Replacement Required | ✅ | ❌ months | ✅ | ❌ |
| Installs in Existing Air Ducts | ✅ | ❌ | ❌ | ❌ |
⚠️ Note: Results depend on the size of the area, airflow volume and system design — 2S provides a free assessment before every installation.
Standards Supporting This Technology
Standards & Certifications
CE — European Conformity
Applicable products comply with relevant European Union requirements and standards.
US Standards & Testing
U.S. solutions are evaluated against applicable standards and testing requirements.
TÜV PROFiCERT — German Certification
Bioxigen® production and product inspection processes have been certified by TÜV Hessen, Germany.
ISO — International Standards
Relevant products and testing follow applicable ISO standards according to technology and application.
Independent Laboratory Tested
Relevant technologies are supported by independent laboratory and institutional testing, including Bioxigen® testing according to EN 16777:2019.
— FAQ —
Frequently Asked Questions About Air Purification Systems
Are Cold Plasma and Non-Thermal Plasma (NTP) the same?
Yes, they are exactly the same. Cold Plasma is the term more commonly used in general communication, while Non-Thermal Plasma (NTP) is the scientific term used in ASHRAE 62.1 documentation and academic research. Both refer to the same process: generating RONS (Reactive Oxygen and Nitrogen Species) using electrical current at room temperature.
Do we need to dismantle the existing air-conditioning system?
No. The In-Duct NTP system is designed to be installed inside existing AHU or FCU ductwork. Installation takes 1–3 days, does not require the building to stop operating and does not damage the existing system.
Does the system generate dangerous ozone?
No. NTP systems that meet CE and TÜV ProfiCert standards produce ozone at < 0.04 ppm, significantly below the WHO Guideline (0.1 ppm) and OSHA Standard (0.1 ppm). This level is even below the level detectable by humans.
Is there evidence supporting the 99.9% pathogen-elimination performance?
Yes. Real-world testing in a healthcare facility showed measurable reductions. Measurements at the Ca dei Fiori elderly-care facility in Treviso, Italy, showed a 47% reduction in Total Mesophyll Load (total airborne bacteria), a 68% reduction in mould spores, no detectable coliforms after the system was switched on, and reductions of up to 82.5% in the highest-risk room.
What is the difference between the Stand-Alone and In-Duct systems?
The main difference is how purified air is distributed. In-Duct NTP operates through the central air-conditioning ductwork and covers all rooms simultaneously. Stand-Alone NTP is an individual Plug & Play unit for rooms or targeted areas of 10–175 m³. Some projects use both systems together to cover all zones.