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The Thesvin single/double flange high-efficiency filter is a panel filter built for ducted and FFU installations where the flange is the primary locating and sealing interface. It filters airborne particles at E11 or E12 efficiency using high-throughput ultra-fine glass fibre media in an anodized aluminium alloy frame. It is aimed at cleanroom, HVAC terminal and pharmaceutical or electronics projects that need a defined flange fit rather than a generic box filter.
This filter is designed around the flange. Whether you specify a single flange or a double flange, the flange edge is the datum that positions the filter in the duct or ceiling grid, and it is the surface that compresses against the host frame to close the gap. The frame itself is anodized aluminium alloy profile, which keeps the panel light enough to handle during changeout while resisting corrosion in humid or chemically active airstreams.
Single-flange versions suit standard FFU top-supply or ceiling-recessed layouts, where the filter seats from one side and is held by the grid or housing. Double-flange versions add a second sealing face and are chosen where the connection needs sealing on both faces, such as duct-to-duct transitions or installations with a pressure differential across the filter. In both cases the depth is 88 mm, so the flange geometry rather than the panel depth is what you match to the host device.
The practical fitment questions are the flange outside dimensions, the flange width, the bolt or clamp positions if any, and the clear opening the filter must pass through. Because Thesvin produces to drawing, these dimensions can be set to your existing housing instead of forcing a housing modification. The 287 × 592 mm and 592 × 592 mm sizes shown below are the standard starting points; non-standard flange sizes are made to order.
The media is high-throughput ultra-fine glass fibre paper, selected for low resistance at the rated air volumes. At E11 (sub-high-efficiency) and E12 (high-efficiency) grades to EN 1822, the filter removes fine particulate from the supply air in cleanrooms, hospital operating theatre ventilation, HVAC terminal units and FFU systems in pharmaceutical and electronics plants.
Typical duties include protecting ISO-classified cleanrooms in semiconductor and microelectronics facilities, serving as the terminal filter in commercial air handling systems, and providing the final filtration stage in food and pharmaceutical processing areas where airborne contamination control matters. The filter is not a pre-filter; it is intended for the high-efficiency stage, with the upstream filtration selected to protect the media and achieve the expected service life.
| Item | Detail |
|---|---|
| Product name | Single/Double Flange Medium & HEPA Filter |
| Filter class (EN 1822) | E11 (sub-high-efficiency) / E12 (high-efficiency) |
| Media | High-throughput ultra-fine glass fibre filter paper |
| Frame | Anodized aluminium alloy profile |
| Core applications | Pharmaceutical and electronics cleanrooms, hospital operating theatre ventilation, HVAC terminal units, FFU systems |
| Standard sizes and rated airflow (W × H × D) | 287 × 592 × 88 mm (E11 rated 1000 m³/h; E12 rated 500 m³/h) 592 × 592 × 88 mm (E11 rated 2000 m³/h; E12 rated 1000 m³/h) |
| Customisation (OEM/ODM) | Flange edge dimensions, non-standard air volumes and special shapes produced to order; the company operates a CNAS-accredited testing centre and holds ISO 9001 and IATF 16949 certification. |
Thesvin works to IATF 16949 (certified in 2024) and controls dimensional consistency through IQC, IPQC and OQC: incoming inspection of media and frame profile, in-process checks during assembly, and outgoing checks before packing. The company's own laboratory is CNAS-accredited and can issue reports on filtration efficiency, dust holding capacity and resistance. The production base covers 50,000 m², including six clean workshops totalling 20,000 m², and the company holds ISO 9001, ISO 14001 and ISO 45001 certification. Products meet REACH and RoHS requirements and compliance documents can be supplied. Thesvin has more than 20 years of filtration product development and manufacturing experience, exports to Europe, the United States, Japan and Korea, and has developed over 1,000 filtration solutions. Multiple automated production lines support monthly output in the millions of pieces. The company is located in Zhongshan, Guangdong, China.
To quote accurately, send the device or housing model, the flange size or a drawing, the rated airflow, the operating conditions (temperature, humidity, any chemical exposure) and the quantity required. If you do not have a drawing, send an old part or clear photos with dimensions. Go to /en/contact and the team will confirm fitment and pricing.
Fitment depends on the flange interface, not only the panel size. Send the host frame or duct opening dimensions, the flange width and whether you need single or double sealing faces, and Thesvin will match the flange to your housing. Standard sizes are 287 × 592 × 88 mm and 592 × 592 × 88 mm, with custom flange dimensions available.
Yes. An old filter or clear photos with dimensions are often the fastest way to confirm fitment. Thesvin can measure the flange and panel from the sample and quote against that interface, which avoids errors in transferred drawings.
The filter is available in E11 (sub-high-efficiency) and E12 (high-efficiency) to EN 1822, using high-throughput ultra-fine glass fibre media. The required class should be stated with the airflow, because the same 592 × 592 × 88 mm panel is rated 2000 m³/h at E11 and 1000 m³/h at E12.
Yes. Thesvin supports OEM/ODM for flange edge dimensions, non-standard air volumes and special shapes. The company operates a CNAS-accredited testing centre and holds ISO 9001 and IATF 16949 certification, so custom parts can be checked against the agreed specification.
Send the housing model, flange size or drawing, airflow, operating conditions and quantity through the contact page. Thesvin confirms the interface, then provides a quote for the agreed specification. Sample arrangements are confirmed with the quotation based on the customisation required.
MOQ and lead time are confirmed with the quotation and depend on whether the size is standard or custom and on the order quantity. Because the filter is built to the flange interface, the drawing approval step is part of the schedule and should be included in your planning.
Replacement interval depends on the upstream pre-filtration, operating airflow and contamination load in the host system. Thesvin can advise on a changeout schedule once the operating conditions are known; the E11 and E12 ratings and the 88 mm depth remain fixed across the standard range.
Go to <a href="/en/contact">/en/contact</a> and send the device or housing model, flange size or drawing, airflow, operating conditions and quantity. Thesvin will confirm fitment and respond with a quotation.