Cylindrical HEPA Filter for Car Air Purifiers (Custom OEM/ODM)

A cylindrical HEPA filter for car air purifiers is a finished, 360° radial-flow filter element that removes fine particulate matter from cabin air inside a vehicle. It is built from pleated PP, PP+PET or PTFE media and is available in H11 to H13 HEPA grades, with optional pre-filters or activated carbon layers. Oltaven manufactures the complete element — media, pleating, forming and sealing — for car air purifier brands, distributors and OEM/ODM buyers.

From Media to Finished Filter

Buyers often compare filter media as if the paper alone decided performance. In a finished cylinder, it does not. The same roll of HEPA media can become a low-resistance long-life element or a high-resistance short-life one, depending on how it is pleated, formed and sealed.

Pleating sets the effective surface area. Tight, high-density pleats pack more media into a small cylinder, increasing dust-holding capacity and lowering face velocity at a given airflow. Forming then turns the pleat pack into a 360° ring, so air enters evenly around the circumference instead of through one flat face. Even airflow distribution keeps pressure drop predictable and lets the whole media area share the dust load. Sealing closes the ends and the base flange, so unfiltered air cannot bypass the media — the step that decides whether the rated efficiency is actually delivered.

At Oltaven we sell finished filters, not media by the roll. Each cylindrical element is a complete assembly: pleated media, formed ring, end caps and base sealing flange, optionally combined with an inner or outer pre-filter or a column of activated carbon. The customer receives a part that can go straight into an air purifier on an assembly line.

What Decides Finished Performance

Media choice

Three media families are available. PP meltblown is the economical choice for H11–H13 particulate filtration. PP+PET composite media balances mechanical strength and pleat stability, which matters in vibrating vehicle environments. PTFE media suits high-efficiency grades where low resistance and consistent efficiency are priorities. The selected grade sets the baseline particle removal level; the forming and sealing determine how much of that baseline survives in the finished part.

Pleat density and effective area

High-density pleating raises the effective media area inside a fixed cylinder envelope. More area means lower air velocity through the media, which usually means lower resistance and higher dust capacity for the same filtration grade — the mechanism behind the CADR gains a 360° intake design can bring to an air purifier. It also means the filter lasts longer before resistance rises to the point where airflow drops.

Framing and sealing

The base sealing flange and end caps define the air path. A well-formed seal forces all intake air through the media; a poor one allows bypass, which shows up as reduced efficiency even when the media itself tests well. Oltaven moulds and forms these parts to the customer's drawing, so outer diameter, inner diameter, height and base flange geometry are matched to the purifier housing.

Composite options

Where the application needs more than particles, an inner or outer preliminary dust screen can be added, or a built-in column or modified activated carbon layer for formaldehyde and odour removal. These layers change resistance and service life, so they are specified together with the HEPA grade rather than added afterwards.

Applications

The cylindrical format suits air paths that draw air from all sides. Typical uses include factory-fitted and aftermarket car air purifiers, cup-shaped purifiers that sit in a cup holder, centre-console purifiers, desktop compact purifiers, and combined humidifier-purifier units. The 360° intake design is useful where the housing is narrow and a flat panel filter would create a high-velocity hot spot. Because each element is made to the customer's dimensions, the same construction approach can serve a range of purifier sizes.

Technical Specifications

The Oltaven Factory and Certifications

Oltaven works as an OEM/ODM partner and has developed more than 1,000 filtration solutions over 20 years of research and manufacturing experience. That project history is the practical base for custom cylindrical elements: dimensions, media grade, framing and packaging are all built around a customer's purifier rather than a catalogue list.

The production base covers 50,000 m², including six cleanrooms with a combined area of 20,000 m². Filter elements are produced, assembled and packed in these controlled rooms to limit secondary contamination. Our in-house laboratory holds CNAS accreditation and can issue test reports covering filtration efficiency, dust-holding capacity and resistance, which buyers can use when validating a specification. The plant holds IATF 16949 automotive quality management certification, obtained in 2024, alongside ISO 9001, ISO 14001 and ISO 45001 system certification. Products meet REACH and RoHS requirements, and compliance documents can be supplied. IQC, IPQC and OQC checks cover the process from incoming material to outgoing goods, and automated production lines support monthly output in the millions of pieces. The company is located in Zhongshan, Guangdong, China, and has exported to Europe, the United States, Japan and Korea for more than 20 years.

OEM/ODM Workflow

1. Share the purifier model, a drawing or the required outer diameter, inner diameter, height and base flange details.
2. Confirm airflow, target HEPA grade, whether a pre-filter or activated carbon layer is needed, and the operating environment.
3. Oltaven proposes media, pleat density and forming, then quotes tooling and unit price.
4. Sample elements are produced for fit and performance checks.
5. After sample approval, production runs with IQC, IPQC and OQC checks, and CNAS test reports are issued where required.
6. Packaging is customised — colour box, blister, logo printing — and the order ships with batch traceability.

Start a Custom Project

To move a cylindrical HEPA project forward, send us the device model, size or drawing, required airflow, operating conditions and estimated quantity. Our team will respond with a media and forming proposal and a quotation. Contact Oltaven to discuss your requirements.