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This is a cylindrical HEPA filter with granular activated carbon, made by Ranveth for desktop and bedside air purifiers that need dust removal and formaldehyde/odour control in one cartridge. It filters fine particulate matter through PP, PP+PET or PTFE media and locks up formaldehyde and odours with high-iodine coconut-shell carbon. It is built for appliance makers and OEM buyers who need a thin composite filter that fits a specific airflow path, not a catalogue-sized drop-in.
The filter is a two-in-one composite. The particulate layer is chosen first: high-precision PP polypropylene for general desktop use, moisture-resistant PP+PET composite where humidity swings are expected, or PTFE high-efficiency microporous membrane where the airflow path is tight and resistance has to stay low. The gas layer is granular activated carbon, either high-iodine coconut-shell carbon for broad odour and VOC capture or a catalyst-modified carbon aimed specifically at formaldehyde.
The pairing matters more than either layer alone. A denser HEPA layer raises efficiency but also raises pressure drop, so the carbon bed is shaped and filled to match the airflow the machine can deliver. Because the carbon is granular and directionally filled rather than a flat impregnated sheet, the gas stage can carry enough carbon for meaningful formaldehyde capacity without stealing the thin profile the enclosure was designed around. The result is a filter whose efficiency, airflow resistance and service life are set together at the specification stage, not traded off after tooling is cut.
HEPA grades from F7 to H13 are available, selected against the device airflow and the target cleanliness rather than picked as a default. Common formats include rectangular flat panels, cylinders, and sector or polygonal shapes for small appliances, so the media stack can follow the fan and duct geometry instead of forcing the housing to change.
| Item | Detail |
|---|---|
| Product name | HEPA & Granular Activated Carbon Filter |
| Particulate media | High-precision PP polypropylene; moisture-resistant PP+PET composite; PTFE high-efficiency microporous membrane |
| Gas-phase media | High-iodine coconut-shell granular activated carbon; catalyst-modified activated carbon for formaldehyde |
| Particulate efficiency | HEPA grade selectable from F7 to H13, specified to the device airflow and purification target |
| Common formats | Rectangular flat panel; cylindrical; sector and polygonal shapes for small appliances |
| Typical host products | Desktop and bedside mini air purifiers; car air purifiers; fresh-air ventilation modules; humidifying purifier combos |
| Size customisation | OEM/ODM flexible tooling: any length, width, thickness and foam sealing edge to match the customer's duct and structure |
| Quality systems | ISO 9001, ISO 14001 and IATF 16949; factory release checked by a CNAS-accredited laboratory |
The filter is aimed at small-format air movement. Desktop and bedside purifiers are the main hosts, where a thin composite leaves room for the fan and electronics. Car air purifiers use the cylindrical or compact panel versions where vibration and space are both tight. Fresh-air ventilation modules and humidifying purifier combos use the same media pairing when the unit has to handle both particles and odours in one pass.
Because the format is flexible, the filter can be specified as a cylinder, a flat panel or a sector shape cut to the housing. That flexibility is useful when a product refresh changes the duct but keeps the same fan, since the media grade and carbon load can be rebalanced without a new enclosure.
To quote a custom filter, send the device or vehicle model, the size or a drawing of the filter seat, and the airflow the unit delivers. Operating conditions matter as well: expected humidity, the pollutants you are targeting, and whether formaldehyde or general odour control is the priority. Tell us the quantity you expect for the first order and the annual volume, and we can propose a media grade and carbon type that fit the airflow rather than over-specifying the HEPA stage.
If you already have a sample or a competitor part, send it and we will match the fit and propose the layer build. All dimensions, thickness and foam sealing edges are made to your drawing, so a dimensioned sketch is often enough to start tooling.
Media choices here are test-backed. Ranveth's own laboratory is CNAS-accredited and issues reports covering filtration efficiency, dust holding capacity and resistance, so the pairing of HEPA grade and carbon load can be checked before a tool is cut. Production runs in a 50,000 m² plant that includes six cleanrooms totalling 20,000 m², which keeps contamination out of the media stack. The factory holds IATF 16949, awarded in 2024, alongside ISO 9001, ISO 14001 and ISO 45001 systems. Products meet REACH and RoHS requirements and compliance documents can be supplied.
Ranveth has more than 20 years of filter development and manufacturing experience and has supplied customers in Europe, the United States, Japan and Korea for over 20 years. More than 1,000 filter solutions have been developed, and automated lines support monthly output in the millions of pieces. Quality control runs through IQC, IPQC and OQC. The company is based in Zhongshan, Guangdong, China.
If you are evaluating a filter for a desktop, car or ventilation product, send the device model, size or drawing, airflow or water flow, operating conditions and quantity through our contact page. Our team will reply with a proposed media pairing and a quote, and can arrange samples for fit and performance checks.
It pairs a particulate layer of high-precision PP, moisture-resistant PP+PET composite or PTFE microporous membrane with granular activated carbon. The carbon is high-iodine coconut-shell grade or a catalyst-modified grade aimed at formaldehyde. This two-in-one build lets one cartridge handle dust and odours in a thin profile.
HEPA grades from F7 to H13 are available. The grade is selected against the device airflow and the target cleanliness rather than set as a default, because a denser layer raises resistance. Ranveth's CNAS-accredited lab can verify efficiency, dust holding capacity and resistance on the proposed build.
Yes. The filter is offered as a rectangular flat panel, a cylinder, or a sector or polygonal shape for small appliances. Length, width, thickness and foam sealing edge are made to your duct and structure drawing under OEM/ODM flexible tooling. More than 1,000 filter solutions have been developed for previous projects.
Send the device model, size or drawing, airflow, operating conditions and expected quantity through the contact page. The team will propose a media pairing and carbon type, then quote. Samples can be arranged for fit and performance checks before tooling is committed.
MOQ depends on the specification and is agreed case by case for custom builds. Because the filter is made to your drawing, the first order quantity is discussed together with the media grade and tooling. Contact us with your forecast and we will confirm the MOQ for your configuration.
Lead time is confirmed with the quotation and depends on the media grade, tooling status and order quantity. Once the specification is fixed, the team will give a production schedule for your build. For planning, include your target launch date in the inquiry.
Service life depends on the carbon load, the HEPA grade and the operating conditions of the host device, so it is set during specification rather than quoted as a single figure. The media pairing is chosen so that efficiency, resistance and life are balanced for your airflow. Ask for a life estimate with your sample request.
The factory holds ISO 9001, ISO 14001, ISO 45001 and IATF 16949 systems, and products meet REACH and RoHS requirements. Compliance documents can be supplied with the order. Ranveth has exported to Europe, the United States, Japan and Korea for over 20 years. Send your market requirements with the inquiry.