KJF-B02 Air Conditioning Companion
The Legom KJF-B02 Central Air Conditioning Ion Purifier is a multi-technology air purification add-on designed for integration with central air conditioning systems in living rooms, bedrooms, and offices. Operating on 12VDC at only 5.5W, the KJF-B02 combines four distinct purification technologies — negative oxygen ions, ultraviolet photocatalyst, plasma electrostatic dust removal, and photolysis oxidation — into a single unit that installs within the AC system without occupying any room space or requiring filter replacements.
Where the KJF-B03 uses ion-catalytic dual purification, the KJF-B02 adds UV photocatalyst sterilization, plasma electrostatic filtration of particles below 5 microns, and photolysis oxidation with trace ozone for odor removal and harmful gas decomposition — making it the more comprehensive purification platform in the Legom AC companion range. At just 5.5W on 12VDC, it delivers this four-technology purification with near-zero energy impact on the building’s electrical systems.
Key Benefits
- Four purification technologies in one unit – Combines negative oxygen ion purification, UV photocatalyst sterilization, plasma electrostatic dust removal, and photolysis oxidation in a single integrated system — providing broader spectrum air treatment than single-technology purifiers
- Negative oxygen ions – Remove dust, allergens, and bacteria from the air while generating ions that circulate through the space to support human relaxation, stress relief, sleep quality, and immune function through their effect on cell activity and the nervous system
- Ultraviolet photocatalyst sterilization – UV light activates a photocatalytic reaction that kills airborne viruses and bacteria in the air stream passing through the unit
- Plasma electrostatic dust removal – High-voltage plasma field filters out most airborne particles smaller than 5 microns, capturing fine dust, smoke, pollen, and other particulate matter without requiring a replaceable filter medium
- Photolysis oxidation with trace ozone – Decomposes odor molecules and breaks down harmful gases including formaldehyde through photolysis, using trace ozone levels within safe indoor air quality limits
- No filter consumables, no cleaning, no replacement – The multi-technology purification system requires no consumable media at any point during the unit’s service life, eliminating ongoing maintenance costs and logistics
- Near-zero power consumption at 5.5W / 12VDC – The lowest power consumption in the Legom air purifier range, operating on 12VDC for compatibility with low-voltage AC system power supplies
- No room footprint – Installed within the central AC system, invisible in the served space
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | KJF-B02 |
| Power | 5.5W |
| Rated Voltage | 12VDC |
| Purification Technologies | Negative oxygen ions, UV photocatalyst, plasma electrostatic, photolysis oxidation (trace ozone) |
| Particle Removal | Most particles < 5 microns |
| Consumables | None |
| Dimensions | 605 × 200 × 84mm |
| Weight | 2.8 kg |
| Installation Location | Central AC system (living room, bedroom, office) |
KJF-B02 vs KJF-B03 Comparison
| Parameter | KJF-B02 | KJF-B03 |
|---|---|---|
| Power | 5.5W | 20W |
| Voltage | 12VDC | 220VAC |
| Purification technologies | 4 (ions + UV + plasma + photolysis) | 2 (ion-catalytic dual) |
| UV sterilization | Yes | No |
| Odor/gas decomposition | Yes (photolysis) | No |
| Particle filtration threshold | < 5 microns | PM2.5 (ion-catalytic) |
| Consumables | None | None |
| Dimensions | 605 × 200 × 84mm | 667 × 118 × 88mm |
| Target application | Living room, bedroom, office | Central AC return air outlet |
Application & Use Cases
- Living rooms with central ceiling cassette AC – The KJF-B02’s broader 200mm width and four-technology system make it well suited to larger living spaces served by ceiling cassette AC units, where odor removal and broader spectrum purification are priorities alongside PM2.5 and bacteria elimination
- Bedrooms requiring UV sterilization – UV photocatalyst sterilization provides a meaningful additional protection layer against airborne pathogens in sleeping environments where immune vulnerability during sleep makes pathogen reduction particularly valuable
- Offices with odor or VOC concerns – Photolysis oxidation with trace ozone actively decomposes odor molecules and harmful gases including formaldehyde, making the KJF-B02 suited to newly renovated offices or spaces with known VOC sources where the KJF-B03’s ion-only approach may be insufficient
- AC systems with 12VDC auxiliary power available – The 12VDC rating enables integration with AC systems that provide a low-voltage auxiliary supply, without requiring a separate 220VAC connection at the installation point
- Medical and clinical environments requiring multi-technology pathogen control – The combination of negative ions, UV photocatalyst, and plasma electrostatic provides complementary pathogen elimination mechanisms suited to higher-risk indoor environments
Installation Notes
- The KJF-B02 is installed within the central AC system. Confirm the installation point dimensions are compatible with the 605 × 200 × 84mm unit body before ordering
- The unit operates on 12VDC. Verify that a 12VDC power supply is available at the installation point, either from the AC system’s auxiliary supply or from a dedicated 12VDC adapter connected to a 220VAC source
- The unit contains a UV lamp for photocatalyst activation. Ensure the UV lamp is not directly visible to room occupants after installation — it must remain inside the AC duct or grille housing
- The photolysis oxidation function produces trace ozone as a byproduct of the decomposition process. Ozone levels are designed to remain within safe indoor air quality limits during normal operation. Ensure adequate air circulation in the served space
- No filter media replacement is required. The plasma electrostatic collector plates and ionization module may accumulate particles over time — periodic inspection is recommended, but the unit is described as requiring no cleaning or replacement
- Do not install in locations where the UV lamp or electronic components are exposed to direct water contact or condensation drip from the AC evaporator
Frequently Asked Questions
What is the difference between the KJF-B02 and KJF-B03?
Both are central AC ion purifiers that install within the AC system without occupying room space. The KJF-B02 is the more comprehensive purification platform, combining four technologies (negative ions, UV photocatalyst, plasma electrostatic, photolysis oxidation) versus the KJF-B03’s two-technology ion-catalytic approach. The KJF-B02 also adds UV sterilization and odor/gas decomposition via photolysis, and operates on 12VDC at only 5.5W versus the KJF-B03’s 220VAC at 20W. Choose the KJF-B02 when UV sterilization, odor decomposition, and lower power consumption are priorities. Choose the KJF-B03 when 220VAC is the available power source and a simpler installation is preferred.
What is photolysis oxidation and is trace ozone safe?
Photolysis oxidation uses UV light to break down odor molecules and decompose harmful gases including formaldehyde and VOCs into harmless byproducts. This process produces trace amounts of ozone as a byproduct of the photochemical reaction. The KJF-B02 is designed to produce ozone at levels well below the WHO and national indoor air quality guidelines for continuous exposure. In well-ventilated spaces with normal AC air circulation, trace ozone disperses quickly and does not accumulate to harmful levels. The purification benefit of odor and harmful gas decomposition far outweighs the trace ozone byproduct in typical residential and office applications.
How does UV photocatalyst sterilization work?
The UV photocatalyst system uses ultraviolet light to activate a titanium dioxide (TiO2) photocatalytic coating. When UV light strikes the TiO2 surface, it generates reactive oxygen species that break down the cell walls of bacteria and viruses passing through the air stream, killing them without producing harmful residues. The reaction is self-sustaining as long as the UV lamp is operating — no consumable catalyst is used up in the process.
Does the KJF-B02 also provide fresh outdoor air?
No. Like the KJF-B03, the KJF-B02 purifies the recirculated indoor air passing through the central AC system. It does not introduce outdoor fresh air or reduce CO2 concentration. For CO2 dilution through fresh air supply, a separate fresh air ventilation product should be considered alongside the KJF-B02.
What maintenance does the KJF-B02 require?
The product description states no cleaning or replacement is required for the purification system. The plasma electrostatic and ionization modules do not use consumable media. The UV lamp has a finite operational lifespan — contact the Legom team for UV lamp service life and replacement specifications for your specific installation.
OEM & ODM Customization
Legom supports OEM and ODM services for the KJF-B02 Central AC Ion Purifier. Our engineering team can customize dimensions, specifications, and branding to match specific AC system configurations. All customization projects are handled with strict confidentiality. Contact us via WhatsApp or info@legomsmart.com.
User Manual
Product information last reviewed by the Legom Technical Team. For the most current specifications, refer to the official datasheet or contact our sales team.
Custom OEM & ODM Solutions
Legom is a direct manufacturer offering end-to-end OEM and ODM services. With our in-house engineering and production capabilities, we work closely with distributors and system integrators to deliver fully customized solutions under strict NDA.
