Honeycomb Activated Carbon Filter for Air Purifiers and HVAC

This honeycomb activated carbon filter is a finished filter built on a high-strength, moisture-resistant plastic honeycomb frame and filled with high-iodine-value granular activated carbon or catalyst-modified carbon for aldehyde removal. It targets formaldehyde (HCHO), benzene, ammonia, TVOCs and stubborn odors, and is intended for air purifiers, fresh-air systems, car cabin filters and central air handling units. Oltaven manufactures the finished filter, not just the media, so media choice, pleating (or in this case honeycomb forming), framing and sealing all come together in one controlled process.

From Media to Finished Filter

Media sets the ceiling on what a filter can adsorb, but the finished product decides how much of that ceiling you actually reach. In a honeycomb carbon filter, the plastic honeycomb framework holds the carbon granules in a fixed geometry. The open cells give air a short, straight path through the carbon bed, which keeps resistance low even at high airflow. If the carbon is packed too loosely, air bypasses it and efficiency falls; if it is packed too densely, resistance rises and the fan has to work harder. Oltaven balances carbon loading (grams per filter) against cell size and thickness so the finished filter delivers the intended adsorption capacity at a workable pressure drop.

Forming also decides durability. The engineering plastic honeycomb resists moisture and corrosion, so the filter does not collapse or shed carbon in humid air. Framing and sealing keep the carbon bed in place and prevent air from sneaking around the edges. That is why we sell finished filters: the same carbon can perform very differently depending on how it is held, framed and sealed.

What Decides Finished Performance

Three factors determine how a honeycomb carbon filter performs in the field: carbon quality, structural geometry and sealing integrity.

Carbon quality. High-iodine-value activated carbon offers more micropore surface for capturing volatile organic compounds. For aldehyde removal, a catalyst-modified carbon can convert formaldehyde rather than only trapping it. Oltaven selects carbon grade according to the target gas and the required service life.

Structural geometry. Cell size, wall thickness and filter depth together set the contact time between air and carbon. Smaller cells and deeper beds increase contact time and efficiency but also raise resistance. The plastic honeycomb structure maintains a very high porosity, so air flows smoothly with low resistance while still contacting the carbon surfaces.

Sealing and framing. A filter is only as good as its edges. The frame must hold the honeycomb firmly and seal against the housing so that all air passes through the carbon bed. The moisture-resistant plastic frame also prevents swelling and warping in humid conditions.

Because Oltaven controls all three factors in-house, we can tune the finished filter to your device’s airflow and space rather than asking you to design around an off-the-shelf part.

Applications

Honeycomb activated carbon filters are used wherever odors and volatile organic compounds need to be removed at low airflow resistance:

• Household and commercial air purifiers – as the odor and TVOC stage, often combined with a particle filter.
• Fresh-air ventilation systems – to reduce outdoor pollutants and odors entering the indoor environment.
• Car cabin air filters – to remove exhaust odors and VOCs from the passenger compartment.
• Central air handling units – in return-air odor control sections where low pressure drop is important.

In each case, the filter’s dimensions, cell size and carbon loading can be matched to the device’s airflow and available space.

Technical Specifications

The Oltaven Factory and Certifications

Oltaven’s OEM/ODM capability is the starting point for every project: we have developed more than 1,000 filtration solutions, and we build finished filters to your drawing, not just supply media. Production takes place in a 50,000 m² plant in Zhongshan, Guangdong, China, which includes six cleanrooms totalling 20,000 m². Our in-house laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust-holding capacity and resistance. The company holds IATF 16949 (achieved in 2024) and ISO 9001, ISO 14001 and ISO 45001 system certifications, and products comply with REACH and RoHS environmental regulations, with compliance documents available. With more than 20 years of filtration R&D and manufacturing experience, we have exported continuously to Europe, the United States, Japan and South Korea for over 20 years.

OEM/ODM Workflow

1. Requirement review – you share the device model, target pollutants, airflow or space constraints, and any drawing.
2. Design proposal – Oltaven recommends carbon grade, cell size, thickness and frame dimensions, and confirms feasibility.
3. Sampling – custom samples are produced to the agreed specification, typically within 7–15 working days depending on complexity.
4. Validation – samples are tested for resistance, efficiency and capacity; reports can be provided from our CNAS-accredited laboratory.
5. Tooling and production – moulds are opened for custom sizes, and mass production follows IQC, IPQC and OQC controls.
6. Delivery – packaging, logo and shipping arrangements are confirmed to your requirements.

Because we control media selection, honeycomb forming, framing and sealing in one facility, changes at any step can be evaluated against the finished filter’s performance.

Start a Custom Project

To quote accurately, we need a few details: your device or vehicle model, the required size or a drawing, the airflow or water flow (if applicable), operating conditions (temperature, humidity, pollutant concentration), and your estimated quantity. Share these with our team through the contact page, and we will respond with a specification proposal and quotation. We welcome long-term OEM/ODM partnerships and are glad to discuss how a custom honeycomb carbon filter can fit your product line.