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This cylindrical HEPA filter is a 360° radial-flow cartridge built for car air purifiers, desktop purifiers and humidifier-purifier combos. It captures PM2.5, pollen, dust and other fine particles, and can be supplied with an optional carbon layer for formaldehyde and odour control. It is made by Ranveth, whose CNAS-accredited lab tests filter media and documents efficiency, dust holding and pressure drop. The filter suits appliance brands, aftermarket suppliers and OEM engineering teams who need a repeatable, test-backed air filter.
Media choice is the first decision, and at Ranveth it is made with the end purifier in mind. We offer PP meltblown, PP+PET composite and PTFE high-efficiency media. Each has its own balance of efficiency, resistance and service life. PP meltblown gives a consistent loft and predictable pressure drop; PP+PET composite adds mechanical strength; PTFE supports high efficiency with low resistance where the motor has limited headroom. We match the grade to the CADR target, so the filter does not become a bottleneck in the air path.
Layer structure follows the media. The standard build is a single HEPA layer of high-density pleats arranged in a 360° ring. The pleat count and depth set the effective area, which in turn drives dust holding capacity and service life. Where the application calls for more, we can add an inner or outer pre-filter to catch coarse dust before it reaches the HEPA layer. We can also add a columnar or modified activated carbon layer for formaldehyde and odour removal. These are optional upgrades, not assumptions — they are specified per project.
The result is a filter where each layer has a defined job. The pre-filter protects the HEPA layer, the HEPA layer does the fine-particle work, and the carbon layer handles gases and odours. This pairing is how we tune efficiency, airflow resistance and life to a given purifier.
| Item | Detail |
|---|---|
| Product name | Cylindrical HEPA Filter for Car Air Purifier |
| Structure | 360° annular air inlet, high-density pleating, maximised effective area |
| Core media options | PP meltblown / PP+PET composite / PTFE high-efficiency media |
| Filtration efficiency | Customisable HEPA grades from H11 to H13, depending on the purifier's requirements |
| Composite upgrades | Optional inner or outer pre-filter; optional columnar or modified activated carbon layer for formaldehyde and odour control |
| Core applications | OEM and aftermarket car air purifiers, desktop compact purifiers, humidifier-purifier combos |
| Dimensions | Tooled to customer requirements — various outer diameter, inner diameter, height and base sealing flange designs |
| Quality system | Produced in a 20,000 m² cleanroom environment; IATF 16949 automotive quality management system and ISO 9001/14001 certified, supporting automotive-grade consistency per batch |
The 360° inlet suits purifiers that draw air from all sides, which is common in car cabins where space is tight. Typical installations include cup-style purifiers that fit a cupholder, centre-console purifiers, and compact desktop units. The cylindrical form also works in humidifier-purifier combinations, where the filter sits in a radial airflow path. Because dimensions are tooled to order, the same media and layer logic can be applied to different housing sizes.
For automotive customers, the IATF 16949 system supports PPAP and APQP workflows. For consumer brands, the same line can produce filters with retail packaging and brand logos. The filter is not limited to one vehicle type; it is specified by the purifier's airflow, dimensions and target efficiency.
To quote a custom cylindrical HEPA filter, we need the following:
With these inputs we can propose a media pairing and layer build, then confirm dimensions and samples.
Ranveth's media choices are test-backed. Our in-house laboratory is CNAS-accredited and can issue reports on filtration efficiency, dust holding capacity and resistance. That means the HEPA grade and layer build we propose for your purifier can be verified before mass production.
Production takes place in a 50,000 m² plant that includes six cleanrooms totalling 20,000 m². The quality system is certified to IATF 16949 (obtained in 2024) and ISO 9001, ISO 14001 and ISO 45001. Products meet REACH and RoHS requirements, and compliance documents are available.
We have more than 20 years of filtration R&D and manufacturing experience, with continuous exports to Europe, the US, Japan and Korea. Our OEM/ODM service covers dimensions, structure, media grade, frame material, logo and packaging, and we have developed more than 1,000 filtration solutions. Multiple automated lines support monthly output in the millions of pieces. IQC, IPQC and OQC checks run through the process. Our address is Zhongshan, Guangdong, China.
Send us your device or vehicle model, size or drawing, airflow or water flow, operating conditions and quantity. We will review the media pairing and layer build and respond with a quotation and sample plan. Contact Ranveth to start the conversation.
The core media can be PP meltblown, PP+PET composite or PTFE high-efficiency material. The standard build is a single HEPA layer of high-density pleats in a 360° ring. Optional pre-filter and activated carbon layers can be added for coarse dust, formaldehyde or odour control.
We customise HEPA grades from H11 to H13 to match the purifier's requirements. The exact efficiency is confirmed by testing in our CNAS-accredited lab, and we can issue a report for the selected media and layer build.
Yes. Dimensions, including outer diameter, inner diameter, height and base sealing flange, are tooled to your drawing or sample. We also customise media grade, pre-filter and carbon layer options, logo and packaging.
Send your device or vehicle model, size or drawing, target airflow, operating conditions and quantity through our contact page. We will review the media pairing and respond with a quotation and sample plan.
The MOQ for standard cylindrical HEPA filters is typically 1,000 pieces. For custom tooling projects, the MOQ is discussed based on tooling complexity. Please confirm with our team for your specific configuration.
Samples of existing specifications can be sent in 3–5 working days. Custom tooled samples usually take 15–25 working days. Mass production lead time is generally 25–35 days, and we recommend planning ahead during peak seasons.
In normal car use, we recommend replacement every 6–12 months, depending on the vehicle environment, air pollution level and daily usage hours. Our CNAS lab can provide life testing and performance decay curves to support your replacement recommendations.
Production runs in a 20,000 m² cleanroom environment under IATF 16949 and ISO 9001/14001 systems. IQC, IPQC and OQC checks are applied through the process. For automotive customers, PPAP and APQP workflows are supported.