HI-IN
The Thesvin cylindrical HEPA filter is a 360° radial-flow filter element designed for car air purifiers, desktop purifiers and humidifier-purifier combos. It captures PM2.5, pollen, dust and other airborne particles, and can be customised with a pre-filter or activated carbon layer for odour and formaldehyde control. It is built for B2B buyers—appliance brands, trading companies and OEM/ODM customers—who need a filter that fits their housing, seals correctly and performs to a specified HEPA grade.
Fitment is the first engineering question with any cylindrical filter. The element seats inside the purifier housing, and the base sealing flange locates it so that unfiltered air cannot bypass the media. Because every purifier has its own internal geometry, Thesvin does not sell a one-size-fits-all cylinder: the outer diameter, inner diameter, height and base sealing flange are made to your drawing or sample. That means the filter drops into the existing cavity, the end caps align with the housing shoulder, and the radial seal lands where the original part sat.
The 360° cylindrical layout also changes how the filter interacts with the fan. Air enters around the full circumference and passes through the pleated media toward the core, so the element must be centred accurately to keep the airflow path even. A correctly matched flange and height keep the filter from rocking or lifting under vibration—an important point in vehicle installations. If you are replacing an existing part, the safest route is to send the old filter or a dimensioned drawing; our team will match the critical dimensions before quoting.
The media captures suspended particulate matter as air is drawn through the pleats. Standard configurations are available in H11 to H13 HEPA grades, with filtration efficiency for 0.3 μm particles from ≥95% to ≥99.95%, depending on the grade selected. For buyers who need a different balance of efficiency and pressure drop, alternative grades can be discussed against your performance target. The pleated, high-density construction maximises effective media area inside a compact cylinder, which supports a higher CADR in the host appliance and extends service life by increasing dust-holding capacity.
Media options include PP melt-blown, PP+PET composite and PTFE high-efficiency material. For cabins with odour or volatile organic compound concerns, a composite build can add an inner or outer pre-filter layer, or a columnar or modified activated carbon layer, to address formaldehyde and odours alongside particles. The filter is intended for car air purifiers, cup-type purifiers, console-mounted purifiers, desktop micro-purifiers and humidifier-purifier combinations. It is not a replacement for cabin filters in the vehicle HVAC system; it is a dedicated element for the purifier unit.
| Item | Detail |
|---|---|
| Product name | Cylindrical HEPA Filter for Car Air Purifier |
| Structure | 360° annular air inlet, high-density pleating for maximum effective area |
| Core media options | PP melt-blown / PP+PET composite / PTFE high-efficiency material |
| Filter class | H11 to H13 available to order, according to end-product purification requirement |
| Composite upgrade | Optional inner/outer pre-filter dust screen or built-in columnar/modified activated carbon layer (for formaldehyde and odour control) |
| Core applications | OEM and aftermarket car air purifiers, desktop micro-purifiers, humidifier-purifier units |
| Dimensions | Tooled to customer requirements: various outer diameter, inner diameter, height and base sealing flange designs |
| Quality system | Produced in a 20,000 m² clean workshop; IATF 16949 automotive quality management system and ISO 9001/14001 certified |
Dimensional consistency is the core of filter fitment, so production is controlled under IATF 16949, obtained in 2024, with IQC, IPQC and OQC checks across the process. Incoming media and components are inspected before release to production; in-process checks monitor pleat geometry, cylinder dimensions and flange integrity; outgoing inspection verifies the finished batch before packing. The factory covers 50,000 m², including six clean workshops totalling 20,000 m², and holds ISO 9001, ISO 14001 and ISO 45001 certification.
Thesvin's own laboratory is CNAS-accredited and can issue test reports on filtration efficiency, dust-holding capacity and resistance. Products meet REACH and RoHS requirements, and compliance documents can be supplied. With more than 20 years of filtration development and manufacturing experience and exports to Europe, the United States, Japan and South Korea, the company has accumulated over 1,000 filtration solutions and supports OEM/ODM customisation of dimensions, structure, media grade, end-cap material, logo and packaging. Multiple automated lines support monthly output in the millions of pieces. Standard orders typically ship in 25–35 days; confirm at order stage.
To get an accurate quote, send us the device or vehicle model, the filter size or a drawing (or the old part), the airflow or water flow requirement, the operating conditions and the quantity you expect. Our engineering team will check fitment and propose the media and grade. Contact Thesvin to start your inquiry.
Fitment depends on matching the outer diameter, inner diameter, height and base sealing flange to your housing. Thesvin tools these dimensions to your drawing or old part, so the filter seats and seals as the original does. Send us the purifier model and dimensions and we will confirm before quoting.
Yes. An old filter is often the most reliable reference for the sealing flange and overall height. We measure the critical dimensions from the sample and propose a matching specification. Photos of the housing seat are also helpful.
Standard configurations achieve H11 to H13, corresponding to ≥95% to ≥99.95% filtration efficiency for 0.3 μm particles, depending on the grade selected. The grade is chosen against your purifier's performance target. Our CNAS-accredited laboratory can test efficiency, dust-holding capacity and resistance.
Yes. A composite build can add an inner or outer pre-filter dust screen, or a columnar or modified activated carbon layer for formaldehyde and odour control. This is specified at inquiry stage so the media and pressure drop suit your unit. It is an optional upgrade, not part of the standard HEPA-only build.
The standard MOQ for this cylindrical HEPA filter is typically 1,000 pcs; tooled or custom versions are quoted according to complexity. Existing-specification samples ship in 3–5 working days, while tooled samples usually take 15–25 working days. Send your drawing, old part and quantity for a formal quote.
Batch orders are generally delivered in 25–35 days after sample approval, depending on order volume. Peak-season schedules should be confirmed at order stage so we can plan capacity. Multiple automated lines support monthly output in the millions of pieces.
In normal vehicle use, a replacement interval of 6–12 months is typical, depending on air quality and daily running hours. The 360° pleated design increases dust-holding capacity to support that interval. We can provide test data to help you set a replacement recommendation for your market.
Yes. Dimensions, end-cap material, media type and grade, activated carbon loading, logo and packaging can be customised. With over 20 years of experience and more than 1,000 filtration solutions, we support private-label programmes. Contact us with your specification to discuss your build.