Thesvin Fresh Air HVAC HEPA Filter – Composite PP Media with Activated Carbon

The Thesvin Fresh Air HVAC HEPA Filter is a composite filter that combines polypropylene (PP) media with modified activated carbon to capture fine particles and adsorb odours. It is designed for fresh air systems, fresh air air conditioners, and central HVAC systems, filtering PM2.5, pollen, dust, formaldehyde, and TVOC. This filter is intended for HVAC engineers, appliance manufacturers, and distributors who need a drop-in or custom-fit filtration solution with documented efficiency grades from F7 to H13.

Fitment and Interface

Fitment is the first consideration in any air filter project. The Thesvin filter is built to match the host unit’s physical interface: the frame, dimensions, and media pleating are configured to the drawing or sample you provide. Whether the filter is a flat panel, a V-bank, or a composite assembly, the goal is to locate correctly in the existing slot, seal against the housing, and maintain the intended airflow path without bypass.

Because every fresh air system has its own tolerances, we manufacture to your specified dimensions. This means the filter’s outer frame, thickness, and pleat count are not generic off-the-shelf values but are set to your unit’s requirements. The composite structure combines a PP media layer for fine particle capture and an activated carbon layer for odour and gas removal within the same envelope. The filter can be supplied in flat, V-shaped, or composite configurations to suit different installation spaces.

For OEM and ODM projects, we work from 2D drawings or 3D models to ensure the filter interfaces correctly with the housing. The frame material, pleat height, and gasket (if specified) are all defined during the design phase, so the finished part is a direct fit. If you are replacing an existing filter, sending us the old part is often the fastest way to replicate the geometry and sealing characteristics.

Correct fitment also affects performance. A filter that is too small or has an inadequate seal will allow unfiltered air to bypass the media, reducing overall efficiency. By matching the filter’s dimensions and frame to the host unit, we help ensure that the rated efficiency is achieved in service. This is particularly important in fresh air systems, where even small leaks can compromise indoor air quality.

What It Filters

The Thesvin Fresh Air HVAC HEPA Filter provides two-stage filtration in a single product. The composite PP media captures fine particulate matter such as PM2.5, pollen, and dust. The modified activated carbon layer adsorbs odours, formaldehyde, and TVOC, helping to improve indoor air quality in residential and commercial spaces.

The filter is available in efficiency grades from F7/F8/F9 (medium efficiency) up to H11/H12/H13 (HEPA). This range allows specifiers to select the appropriate level for the application. For example, H11 to H13 grades are suitable for applications requiring high particle removal, while F7 to F9 grades may be used in less demanding situations or as pre-filters. The activated carbon layer targets gaseous contaminants that particulate filters alone cannot remove, making the filter a dual-function solution.

Typical applications include wall-mounted fresh air units, cabinet-style fresh air air conditioners, and central fresh air systems in homes, offices, and commercial buildings. The filter is not intended for use in environments with high concentrations of corrosive gases or where the activated carbon may be quickly exhausted. For such cases, a different filter configuration may be recommended.

Dimensions and Technical Data

Note: Dimensions are customised to your drawing or sample. Please provide the required size, frame type, and efficiency grade when requesting a quote.

Three Steps to the Right Part

1. Send your drawing or old part. Provide a 2D drawing, 3D model, or a physical sample of the existing filter. Include the host unit model and any interface details such as mounting slots or sealing surfaces.
2. Confirm performance requirements. Specify the required efficiency grade (F7 to H13), whether activated carbon is needed, and any airflow or pressure drop targets. Our team will propose a media and pleat configuration that meets your specifications.
3. Approve the prototype and place the order. We will produce a sample for your evaluation. Once approved, we proceed to production with agreed lead times and quality control.

Following these steps helps ensure that the final filter matches your unit’s fitment and performance requirements. For complex projects, our engineers can assist with design-for-manufacture recommendations.

Delivery and Quality Assurance

Thesvin operates a 50,000 m² manufacturing facility in Zhongshan, Guangdong, China, which includes six clean rooms totalling 20,000 m². Production is managed under ISO 9001, ISO 14001, and ISO 45001 systems. In 2024, we obtained IATF 16949 certification, reflecting our commitment to quality in automotive and similar demanding industries.

Quality control follows a three-stage process: incoming material inspection (IQC), in-process inspection (IPQC), and outgoing quality control (OQC). Each filter is tested for air resistance and filtration efficiency before shipment. Our in-house laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust holding capacity, and pressure drop, providing documented evidence of performance.

We have over 20 years of experience in filter development and manufacturing, and our products are exported to Europe, the United States, Japan, and South Korea. We support OEM/ODM projects with custom dimensions, structures, media grades, frame materials, logos, and packaging. Our cumulative experience covers more than 1,000 filter solutions, and our automated production lines can achieve monthly output in the millions of pieces.

Standard lead times are 15–25 days for standard specifications and 30–45 days for customised products (including tooling). Minimum order quantities (MOQ) are typically 500–1,000 pieces for standard items and 1,000–3,000 pieces for customised items, depending on specifications and packaging. Please confirm details with our sales team for your specific project.

Send Thesvin Your Drawing or Old Part

To receive an accurate quote, please provide the following information:

• Device or vehicle model (if applicable)
• Filter dimensions or a drawing (2D/3D) or an old part sample
• Required airflow rate or water flow rate (if applicable)
• Operating conditions (temperature, humidity, contaminants)
• Estimated quantity and delivery requirements

Our engineering team will review your requirements and respond with a proposal, including recommended specifications and pricing. Contact us today to discuss your fresh air filter needs.