The NPBI In-Duct is an auto-cleaning needlepoint bipolar ionisation system designed for indoor or outdoor duct mounting.

The NPBI In-Duct is an extremely advanced design. It is an auto-cleaning, lightweight, duct-mounted needlepoint bipolar ionization (NPBI™) electronic air cleaner. It is completely maintenance-free unit and is designed for indoor duct mounting and its weathertight seals allow for external duct mounting, it can handle up to 4,800 CFM or 12 tons.

It also features: Universal voltage input, integral display, programmable cleaning cycle, integral alarm contacts, carbon fibre brush emitters, 3/4 quick-turn Duct adapter, 6-foot watertight flexible conduit

Input Voltage: 24VAC to 240VAC
Power: 12 Watts
Frequency: 50/60HZ
Total Ion Output: >400M ions/cc/sec
Airflow Capacity: 4,800 CFM or up to 12 tons
Temperature/Humidity: -20° to 140°F / 0 – 100% RH
Unit Dimensions/Weight: 3.75” Dia. x 7”L / 2.31 lbs
Electric Approvals: UL, cUL, CE
Alarm Contact Rating: 250VAC / 1 A
Compliance & Certifications: UL 867, OSHPD Seismic (OSP), IAQP, UL2998


The NPBI – Needlepoint Bi-Polar Ionisation In-Duct device works by the technology producing a high concentration of positive and negative ions, delivering them to the desired space via the ventilation system. Within the air stream, ions attach to particles, where they combine, become larger and are more easily filtered from the air. When ions come in contact with pathogens, they disrupt the pathogens’ surface proteins, rendering them inactive and no longer harmful. The technology has also been tested against SARS COV2 pathogen with 99.9% inactivation rate


NPBI In-Duct creates a great environment people, not only does it eliminate mould and odours and neutralise bacteria and viruses it also can help with breathing difficulties as a result of allergies or asthma, and it improves the ability to absorb oxygen.