Thesvin Flat Panel HEPA Activated Carbon Composite Filter

The Thesvin flat panel HEPA activated carbon composite filter is a slim, dual-layer air filter that combines particulate removal and odour control in a single panel. It is designed for installation in household air purifiers, desktop purifiers, humidifier-purifier combinations and dehumidifiers, where space is tight and airflow resistance must stay low. The filter is available in PP, PP+PET and PTFE media with a honeycomb activated carbon or modified formaldehyde-removal carbon layer. Thesvin manufactures it in Zhongshan, Guangdong, China, and supplies it as a fully customised OEM component to fit your device cavity.

Fitment and Interface

Fitment is the starting point for this filter. The flat panel format is built around a MAX flat profile that minimises depth so the filter can sit inside compact housings without stealing space from the fan or the air path. The panel is produced to the length, width and thickness you specify, and the frame and sealing are matched to the host device or duct so that air passes through the media rather than around it.

Because the panel is thin and low in resistance, it suits appliances that rely on a small blower to move air through a restricted cavity. The frame edge is configured to locate the filter in its slot and to maintain a consistent seal against the housing, which helps hold efficiency and avoid bypass. Thesvin works from your 3D model, drawing or existing part, so the outer dimensions, frame profile and sealing treatment are agreed before tooling or production begins. This approach is intended for OEM projects where the filter is one component of a larger appliance design and must interface cleanly with the surrounding structure.

What It Filters

The composite construction gives the panel two functions. The HEPA layer captures fine particulate matter, and the carbon layer adsorbs odours and gaseous pollutants. In the FAQ data supplied for this product, the HEPA layer is described as achieving at least 99.97% filtration efficiency for 0.3 μm particles at H13 grade, with H14 available on request. This covers PM2.5, pollen, dust mites and bacteria-sized particles. The activated carbon layer uses high-iodine-value coconut shell or coal-based carbon and is intended for formaldehyde, TVOC and odour adsorption.

Media choice is not fixed. Thesvin offers PP (polypropylene), PP+PET composite and PTFE (polytetrafluoroethylene) as core particulate media, and the carbon layer can be standard honeycomb activated carbon or modified formaldehyde-removal carbon granules. The final dust-removal grade and CADR value depend on the selected media and on the fan characteristics of your appliance, so these are confirmed per project rather than quoted as a single fixed number. The result is a panel that addresses both particle and gas-phase filtration in one part, which is useful where the housing has room for only one filter stage.

Dimensions and Technical Data

Three Steps to the Right Part

1. Share the interface. Send a drawing, 3D model, or the old filter as a sample. Include the device or vehicle model, the cavity dimensions, and any frame or sealing details you need matched. Thesvin uses this to confirm the panel outline and frame profile.
2. Set the performance target. Tell us the airflow or water flow of your system, the target dust-removal grade or CADR, and the odour or gas you need to control. We will recommend a media combination from PP, PP+PET, PTFE and the carbon options, and confirm the expected efficiency and resistance for your fan.
3. Approve the sample, then scale. A sample is produced for fit and performance checks. Once approved, production quantities, packaging and delivery are scheduled. MOQ and lead time are confirmed per specification, with standard MOQ typically 500–1000 pieces and custom specifications usually 2000–3000 pieces; lead time is 25–35 days after order, and samples can be sent within 7–10 days.

Delivery and Quality Assurance

Thesvin holds IATF 16949 certification, obtained in 2024, and applies IQC, IPQC and OQC controls across the production flow to keep dimensional consistency from batch to batch. Incoming media and carbon are inspected, in-process panels are checked for dimensions and frame sealing, and outgoing filters are controlled before packing. This is supported by a CNAS-accredited laboratory that can issue test reports for filtration efficiency, dust holding capacity and airflow resistance.

The manufacturing site covers 50,000 m², including six clean workshops totalling 20,000 m². The company operates ISO 9001, ISO 14001 and ISO 45001 systems, and products can be supplied with REACH and RoHS compliance documentation. With more than 20 years of filtration product development and manufacturing experience, and ongoing exports to Europe, the United States, Japan and South Korea, Thesvin supports OEM/ODM projects covering size, structure, media grade, frame material, logo and packaging. Multiple automated production lines support monthly output in the millions of pieces.

Send Thesvin Your Drawing or Old Part

To move from specification to a quote, send the device or vehicle model, the panel size or a drawing (or the old part), the airflow or water flow of your system, the operating conditions, and the quantity you need. Thesvin will confirm fitment, media selection and lead time. Start the conversation through the contact page.