HI-IN
The Thesvin cylindrical activated carbon filter is a custom-made, round filter element that removes formaldehyde, benzene, ammonia, TVOCs and odours from air. It is built for air purifiers, fresh-air systems, vehicle cabin air filters, central air-conditioning units and industrial exhaust odour control. Thesvin supplies it to OEMs and brand owners who need a drop-in fit, with dimensions, carbon type and end caps matched to the host device or duct.
Because the filter is cylindrical, fitment is decided by three dimensions: outer diameter, inner diameter and height. Thesvin makes every unit to your drawing or sample, so the carbon bed fills the space your device provides without bypass gaps. The round format suits air purifiers with a central fan, where air passes from the outside of the cylinder to the core, and it also fits inline ducts where the filter is held between two flanges.
Location and sealing follow the host design. Thesvin confirms the outer diameter and end-face flatness so the filter seats against the housing stop, and matches the inner diameter to the fan shroud or core tube. End caps can be metal, plastic or paper, and the frame is built to the stiffness your assembly needs. Where the device uses a gasket or foam ring, the filter is dimensioned to compress it evenly. The result is a part that locates positively, seals on the face rather than the edge, and can be swapped without tools in most designs.
If you are replacing an existing filter, the old part is often the best drawing. Thesvin measures the carbon bed, the end caps and the bore, then returns a drawing for approval before tooling or production begins.
The adsorption medium is high-iodine-value activated carbon, available as coconut shell or coal based, with iodine values of 800–1200 mg/g. This structure adsorbs formaldehyde, benzene, ammonia, TVOCs and common odours, and also takes up sulphur dioxide and other acid gases in industrial exhaust. In air purifiers and fresh-air systems the cylinder is typically used as the odour stage behind a particle filter, so dust is removed first and the carbon bed keeps its capacity for gases.
The cylindrical form gives a large carbon volume in a small footprint and a low pressure drop, which helps the host device hold its airflow and energy use. For projects that need extra functions, Thesvin can add coatings for formaldehyde, antibacterial or ozone removal, and can adjust the carbon type and fill weight to the pollutants your application actually carries.
| Item | Detail |
|---|---|
| Core filtration material | High-iodine-value activated carbon |
| Product shape / specification | Cylindrical; 100% customised to customer drawings or requirements |
| Main purification performance | Efficient adsorption and removal of formaldehyde, benzene, ammonia, TVOC and various odours |
| Core application scenarios | Air purifiers, fresh-air system pre-filtration, vehicle cabin air filters, central air-conditioning systems, industrial exhaust odour removal |
| Manufacturer brand | Thesvin, Zhongshan, Guangdong, China |
Thesvin operates under IATF 16949, the automotive quality management system obtained in 2024, and runs IQC, IPQC and OQC checks through production. Incoming carbon and frames are inspected at IQC, dimensions and fill weight are checked in process at IPQC, and finished filters are measured and sampled at OQC. This routine is what keeps batch-to-batch dimensions consistent when you are fitting thousands of units.
The company's own laboratory is CNAS-accredited and can issue reports on filtration efficiency, dust holding capacity and pressure drop. The plant covers 50,000 m², including six clean workshops totalling 20,000 m², and the management system is certified to ISO 9001, ISO 14001 and ISO 45001. Products meet REACH and RoHS requirements, and compliance documents can be supplied for export markets. Thesvin has more than 20 years of filter development and manufacturing experience and has exported to Europe, the United States, Japan and South Korea for over 20 years, with more than 1,000 filter solutions developed to date.
To get a quote, send the device or vehicle model, a drawing or the old part, the required size, the airflow, the operating conditions and your target quantity. Thesvin will confirm the fitment, propose the carbon specification and return a price and sample plan. Start the conversation at /en/contact.
Fitment is confirmed by matching three dimensions: outer diameter, inner diameter and height. Thesvin builds each cylindrical filter to your drawing or sample, so the carbon bed fills the housing without bypass. Send the device model and a drawing or the old filter, and Thesvin will return a fitment drawing for approval.
Yes. The old filter is often the clearest specification. Thesvin measures the carbon bed, end caps and bore, then prepares a drawing for your approval before production. This is common for replacement programmes where the original drawing is no longer available.
The filter uses high-iodine-value activated carbon with an iodine value of 800–1200 mg/g, which adsorbs formaldehyde, benzene, ammonia, TVOCs and odours. Under normal conditions the service life is about 6–12 months, depending on pollutant concentration and airflow. Replace it when odour breakthrough appears or the host device signals a filter change.
Yes. Thesvin customises 100% of cylindrical filters to customer drawings, including outer and inner diameter, height, carbon type and fill weight, end-cap material, added coatings and packaging. More than 1,000 filter solutions have been developed, so the engineering team can match the carbon bed to your airflow and target pollutants.
The standard MOQ is 500–1,000 pcs, and custom models are typically 2,000–3,000 pcs depending on structure. Standard stock items ship in about 3–7 days; custom batches take about 15–25 days after sample approval. Large or peak-season orders are scheduled with you in advance.
Samples are available before ordering: standard sizes are usually free with the customer covering international courier, while custom samples carry a development fee that is credited against the bulk order. To quote, Thesvin needs the device model, size or drawing, airflow, operating conditions and quantity. Send these through the contact page.
Thesvin holds ISO 9001, ISO 14001 and ISO 45001 certification and IATF 16949 obtained in 2024, and products meet REACH and RoHS requirements. Compliance documents can be provided with shipments for customs and market entry. The CNAS-accredited laboratory supports efficiency, dust holding and pressure-drop test reports.
Send the device or vehicle model, a drawing or old part, the size, airflow, operating conditions and quantity through the contact page at <a href="/en/contact">/en/contact</a>. Thesvin will confirm fitment, propose the carbon specification and return a quote and sample plan.