HU-HU
Thesvin fresh air and fresh air conditioning HEPA filters are custom-made panel or V-bank filters that slide into the filter slot of wall-mounted fresh air units, cabinet fresh air conditioners and central HVAC systems. They combine composite PP media for PM2.5 and pollen capture with a high-iodine activated carbon layer for formaldehyde and TVOC odour control, and are supplied in efficiency classes from F7/F8/F9 (medium) to H11/H12/H13 (HEPA). Thesvin builds each filter to the host unit's frame, gasket line and airflow direction, so the part locates and seals as the original does.
Fitment starts with the host interface, not the media. Before production, Thesvin checks the filter slot depth, the frame width available for the gasket, the position of any rail or stop, and the direction of airflow through the unit. The outer frame is then built to those dimensions, with the filter face sized to sit flush against the sealing surface so that air passes through the media rather than around it.
Because fresh air units and fresh air conditioners differ in how the filter is retained, Thesvin offers flat panel, V-bank folded and composite configurations. The frame can be produced in aluminium, paper or plastic to match the rigidity and weight the host device expects, and the filter can be built as a direct replacement for the original part. This is a made-to-drawing service: dimensions, fold count and frame style follow the customer's unit rather than a fixed catalogue size.
The composite PP media captures fine particulate matter, including PM2.5 and pollen, at the efficiency class selected for the application. Downstream of the particulate layer, a modified activated carbon layer with high iodine value adsorbs formaldehyde, TVOC and other odours, so one filter performs both particle removal and odour control. This dual function suits fresh air systems where outdoor air carries both urban particulate and traffic or industrial odours.
Typical installations are wall-mounted residential fresh air units, cabinet fresh air conditioners, and residential or commercial central fresh air (HVAC) systems. The same construction is used for odour-removal filters in fresh air systems, high-efficiency filters in fresh air conditioners, and composite HEPA cartridges for fresh air machines. Efficiency grades from F7/F8/F9 through H11/H12/H13 are available, and the grade is chosen to match the protection stage the unit was designed around.
| Item | Detail |
|---|---|
| Product name | Fresh Air System / Air Conditioner Filter |
| Core filtration media | Composite PP (polypropylene) filter paper + modified odour-removal activated carbon |
| Dust filtration efficiency | F7 / F8 / F9 (medium efficiency) through H11 / H12 / H13 (HEPA) |
| Core performance | Dual effect: removal of fine particulate matter (PM2.5, pollen) + deep adsorption of formaldehyde, TVOC and other odours |
| Product application categories | Odour-removal filter for fresh air systems; high-efficiency filter for fresh air air-conditioners; HEPA composite cartridge for fresh air machines |
| Main application scenarios | Household wall-mounted fresh air units, cabinet fresh air air-conditioners, household and commercial central fresh air systems (HVAC) |
| Specification and size customisation | Tooling and production fully according to the customer's complete-unit requirements; flat panel, V-bank folded and composite types supported |
| Quality and certification | Air resistance and purification efficiency tested before shipment; production follows ISO 9001 quality management and IATF 16949 certification; materials are environmentally safe |
Thesvin operates under IATF 16949 (achieved in 2024) for automotive-industry quality management, and under ISO 9001, ISO 14001 and ISO 45001. Dimensional consistency is controlled through IQC, IPQC and OQC: incoming media and frame materials are inspected, in-process checks follow the fold and frame build, and outgoing inspection verifies the finished filter before packing. This matters for fresh air filters because a small dimensional drift changes how the part seats and seals in the host unit.
The in-house laboratory is CNAS-accredited and can issue reports covering filtration efficiency, dust holding capacity and resistance. The production base covers 50,000 m², including six clean rooms totalling 20,000 m², and multiple automated lines support monthly capacity in the millions of pieces. Products meet REACH and RoHS requirements, and compliance documents can be supplied. Thesvin has more than 20 years of filtration development and manufacturing experience, has developed over 1,000 filtration solutions, and has exported to Europe, the United States, Japan and South Korea for more than 20 years. The company is located in Zhongshan, Guangdong, China.
To receive a quotation, send the device or vehicle model, the filter size or a drawing, the airflow or water flow of the system, the operating conditions, and the quantity required. If no drawing exists, an old filter is enough to start. Contact Thesvin through /en/contact and the team will confirm fitment and performance options for your unit.
Fitment is confirmed from your unit model, slot dimensions and a drawing or old filter. Thesvin builds the frame, gasket line and airflow direction to match the host unit, so the filter seats and seals as the original part does. Send the interface data and the team will confirm compatibility before production.
Yes. An old filter is sufficient to start, because it shows the frame size, fold pattern and sealing surface the unit expects. Thesvin measures the sample and confirms the specification with you before making a custom sample. A drawing is welcome but not mandatory.
The filter covers F7, F8 and F9 medium-efficiency grades and H11, H12 and H13 HEPA grades, with composite PP media and an activated carbon layer for odour control. The grade is selected to match the protection stage and pressure-drop limit of the unit. Thesvin can advise which grade suits your airflow and application.
Yes. Dimensions, structure, media grade, frame material (aluminium, paper or plastic), logo and packaging can all be customised, and flat panel, V-bank folded and composite types are supported. Tooling and production follow the customer's complete-unit requirements. This is an OEM/ODM service built around your device.
Yes. Standard samples can be supplied quickly, and custom samples are typically developed in 7–15 days. A CNAS laboratory report covering efficiency, initial resistance and dust holding capacity can accompany the sample. Send your drawing or old part, airflow and quantity to receive a quotation.
The MOQ for standard products is usually 500–1,000 pieces; custom products are quoted according to specification complexity, and small trial orders are supported for new customers. Standard stock ships within 7–15 days, custom first orders typically take 25–35 days, and repeat orders 15–25 days.
Under standard fresh air system conditions the typical service life is 6–12 months, depending on outdoor air quality, running hours and the pre-filter configuration. Using G4 primary and F7/F8 medium filters ahead of the HEPA stage extends the main filter's life. Thesvin can supply different dust holding capacity versions for your target market.
Production follows ISO 9001 and IATF 16949, with IQC, IPQC and OQC checks controlling dimensional consistency. The CNAS-accredited laboratory can issue reports on efficiency, resistance and dust holding capacity, and REACH and RoHS compliance documents can be supplied. Ask for the documents your project requires when you inquire.