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The Thesvin washable primary efficiency filter is a reusable air pre-filter built around a high-strength aluminum frame and a durable PET media. It captures coarse dust, lint, fibers and insects ahead of secondary or final-stage filters, protecting coils, fans and downstream filter banks in HVAC and ventilation systems. It is intended for facility engineers, HVAC contractors and OEMs who need a filter that can be washed and reused, with G3, G4 or M5 efficiency in standard or custom sizes.
Fitment starts with the frame. The Thesvin washable primary filter uses an aluminum frame that resists corrosion and holds its shape under repeated handling and washing. The frame is rigid enough to keep the media flat across the face, so the filter seats squarely in the track or holding frame of an air handling unit, fresh-air intake or pre-filter bank. A flat, undistorted frame also reduces bypass at the edges, which is where unfiltered air tends to escape.
Because the frame is aluminum, the filter can be removed, washed and reinstalled without the swelling or softening that affects some moisture-sensitive frames. The media is a high-throughput, wear-resistant PET (polyester fiber) mesh, tensioned within the frame to stay in place during airflow and cleaning. Standard sizes follow common imperial face dimensions (12×24, 16×20, 20×20, 20×24 and 24×24 inches) with a 2-inch (46 mm) depth, so they drop into many existing filter racks. If your unit uses a non-standard size, thickness or efficiency, Thesvin supports custom dimensions and configurations based on a drawing or old part.
The rated operating face velocity is 2.5 m/s, which suits high-airflow industrial fresh-air systems. At this velocity, the combination of PET media and aluminum frame keeps resistance low while maintaining structural stability. The filter can be installed in vertical or horizontal filter tracks; check that the frame is fully supported on all sides and that the gasket or sealing surface, if used, is clean and intact. No clips or special fasteners are required beyond the host unit's normal retaining arrangement.
The Thesvin washable primary filter is rated G3, G4 or M5 and is designed as a pre-filter. It intercepts large particles—dust, hair, fibers and insects—before they reach more expensive downstream filters. In a typical HVAC or fresh-air system, this means the primary filter does most of the coarse-particle loading, which helps extend the service interval of secondary and final-stage filters.
Typical applications include commercial central air conditioning intakes, industrial HVAC systems, high-humidity exhaust environments, heavy-dust workshop pre-filtration, cleanroom front-end pre-filtration and fresh-air handling units. The PET media is resistant to wear and can be washed repeatedly; under normal dust loading, Thesvin's product data indicates 5–8 wash cycles, with a single service life of about 2–3 months and an overall life of up to 12–18 months depending on site conditions and maintenance frequency. Because the filter is washable, it can reduce the total cost of ownership compared with disposable primary filters.
| Item | Detail |
|---|---|
| Product name | Washable Primary/Medium Air Filter |
| Efficiency class | G3 / G4 / M5 |
| Media | High-throughput, wear-resistant PET (polyester fiber) mesh |
| Frame | Corrosion-resistant aluminum frame |
| Rated operating face velocity | 2.5 m/s |
| Standard sizes (W × H × D) | 12×24×2 in (289 × 594 × 46 mm); 16×20×2 in (390 × 492 × 46 mm); 20×20×2 in (492 × 492 × 46 mm); 20×24×2 in (492 × 594 × 46 mm); 24×24×2 in (594 × 594 × 46 mm) |
| Customization | OEM/ODM available for non-standard size, thickness and efficiency |
Thesvin's production base in Zhongshan, Guangdong, China, covers 50,000 m², including six clean workshops totaling 20,000 m². The company operates a CNAS-accredited laboratory that can issue test reports for filtration efficiency, dust holding capacity and resistance. The quality system is certified to ISO 9001, ISO 14001 and ISO 45001, and in 2024 the company added IATF 16949 certification for automotive quality management. Incoming materials, in-process production and outgoing goods are controlled through IQC, IPQC and OQC steps to maintain dimensional consistency and performance from batch to batch.
Standard specifications typically ship within 20–30 days after order confirmation, and Thesvin maintains multiple automated production lines with monthly capacity in the millions of pieces to support volume orders and replenishment. Products comply with REACH and RoHS requirements, and compliance documents can be provided. With more than 20 years of filtration experience and 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, with over 1,000 filter solutions developed to date.
To get an accurate quote, send the device or vehicle model, the filter's dimensions or a drawing, the operating airflow or water flow (if applicable), the operating conditions (temperature, humidity, dust loading) and the required quantity. If you do not have a drawing, an old part or clear photos with measurements are enough to start. Contact Thesvin with these details and the team will confirm fitment, efficiency options and lead time.
The Thesvin washable primary filter is available in standard face sizes from 12×24 to 24×24 inches with a 2-inch depth, which fit many common filter racks. If your unit uses a non-standard size, Thesvin can produce a custom filter based on your drawing or old part. Send the unit model and track dimensions for confirmation.
Yes. An old filter or clear photos with measurements can be used to establish the size, frame configuration and media grade. Thesvin will review it and confirm the replacement specification before quoting.
The filter is available in G3, G4 and M5 efficiency classes. It is designed as a pre-filter to capture coarse dust, fibers and insects ahead of secondary or final-stage filters. The appropriate class depends on your downstream filter protection target and dust loading.
Yes. Standard-size samples can be provided free of charge with freight collect. Custom samples may incur a small development fee, which can be credited against a bulk order. Sample lead time is typically 5–7 working days.
Standard sizes typically have an MOQ of 500–1,000 pieces, while custom sizes can be negotiated. Bulk orders usually ship 20–30 days after confirmation. Monthly capacity is in the millions of pieces, supporting large or urgent orders.
Under normal conditions, the filter can be washed 5–8 times. A single service life is about 2–3 months, with an overall life of up to 12–18 months depending on dust load and maintenance. Clean when the pressure drop rises to about twice the initial value, using water at ≤40°C and avoiding high-pressure jets.
The rated operating face velocity is 2.5 m/s, which suits high-airflow industrial fresh-air systems. If your system runs at a different velocity, share the airflow and duct dimensions so Thesvin can review fit and performance.
Yes. Thesvin supports OEM/ODM projects including non-standard dimensions, thickness, efficiency, frame material, logo and packaging. Provide your requirements and target quantity to receive a tailored proposal.