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The Thesvin No-Partition Medium Efficiency Filter is a mini-pleat panel filter that captures micron-sized particles in commercial HVAC systems, cleanroom pre-filtration, and industrial air handling units. It is built for facility engineers and OEMs who need a low-resistance, space-saving filter that seals and locates correctly in the host device. The filter uses glass fibre or PTFE media, an anodised aluminium or stainless steel frame, and hot-melt adhesive separators instead of aluminium spacers.
Fitment starts with the frame. Thesvin supplies this filter in anodised aluminium or stainless steel, both of which hold their shape under pressure and slide into standard filter tracks without binding. Because there are no aluminium partitions between pleats, the filter face is flat and uniform, so it seats against the gasket or sealing surface of an AHU, FFU, or duct-mounted housing. The mini-pleat pack is bonded with hot-melt adhesive, which keeps pleat spacing consistent and prevents media migration that could interfere with the seal.
Depth options of 50 mm and 70 mm cover most common track widths. The filter is not a drop-in replacement for every unit: check the host device’s nominal filter size, the available depth, and the location of any retaining clips or gaskets before ordering. If the original filter was a partitioned type, the same face dimensions usually apply, but the absence of partitions means the new filter may be slightly lighter and easier to handle. For OEMs, Thesvin can adjust frame dimensions and media grade to match an existing housing drawing or a physical sample.
Because the filter has no partitions, airflow distribution across the face is even, which helps avoid localised loading and extends service life. The frame corners are welded or folded to maintain squareness, so the filter does not rack when inserted. This is particularly important in FFU units and ceiling grids where a twisted frame can cause bypass. Thesvin’s quality control includes dimensional checks at incoming, in-process, and outgoing stages to keep frame tolerances consistent from batch to batch.
This filter is rated M6 to E11, covering medium efficiency through sub-high efficiency. It removes particles down to the micron range, including dust, pollen, mould spores, and fine particulate matter that can foul downstream high-efficiency filters. In cleanroom pre-filtration, it protects terminal HEPA filters and extends their replacement interval. In commercial HVAC, it improves indoor air quality without adding significant static pressure to the fan system.
Typical applications include microelectronics and semiconductor cleanrooms, pharmaceutical GMP workshops, hospital operating theatres, high-end commercial building HVAC systems, and FFU units. It is also used in food processing and automotive manufacturing where medium-efficiency filtration is required. The filter can be used as a standalone filter in spaces with moderate air quality requirements or as a pre-filter ahead of a higher-efficiency stage. The low-resistance media helps reduce energy consumption in continuous-duty air handling systems.
The media is available in glass fibre or PTFE, and the hot-melt adhesive separators are applied in a dot pattern that maintains pleat geometry without adding thickness. This construction gives the filter a high dust-holding capacity relative to its weight. The absence of aluminium partitions also eliminates the risk of metal corrosion in humid or mildly corrosive environments, which is an advantage in coastal or industrial locations.
| Item | Detail |
|---|---|
| Product type | High-efficiency panel filter, no-partition mini-pleat design |
| Core material | High-quality glass fibre or PTFE |
| Frame material | Anodised aluminium profile or stainless steel |
| Separator | High-quality hot-melt adhesive |
| Efficiency class | M6 to E11 (medium to sub-high efficiency) |
| Typical applications | Microelectronics and semiconductor cleanrooms, pharmaceutical GMP workshops, hospital operating theatres, high-end commercial HVAC, FFU units |
| Standard sizes and airflow (W × H × D) | 305 × 610 × 50 mm (350 CMH); 610 × 610 × 50 mm (750 CMH); 1170 × 570 × 50 mm (1300 CMH); 1170 × 1170 × 70 mm (3600 CMH). More sizes available with 50 mm or 70 mm depth. |
| Customisation | Non-standard sizes and OEM service available, supported by a 20,000 m² clean workshop and a CNAS-accredited testing centre. |
Thesvin operates a 50,000 m² manufacturing facility in Zhongshan, Guangdong, China, including six clean workshops totalling 20,000 m². The company has been certified to IATF 16949 since 2024, and also holds ISO 9001, ISO 14001, and ISO 45001 certifications. Quality control follows an IQC, IPQC, and OQC flow, with dimensional and performance checks at each stage to support batch-to-batch consistency.
The on-site laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust-holding capacity, and resistance. Products comply with REACH and RoHS requirements, and compliance documents are available on request. With more than 20 years of export experience to Europe, the US, Japan, and Korea, Thesvin supports OEM/ODM projects covering size, structure, media grade, frame material, logo, and packaging. Multiple automated production lines allow monthly output in the millions of pieces.
To get an accurate quotation, send the device or vehicle model, the filter size or a drawing (or a photo of the old part), the required airflow or water flow, the operating conditions (temperature, humidity, and contaminant type), and the quantity you need. Thesvin’s engineering team will review the fitment and recommend the appropriate efficiency class and frame options. Contact us to start your inquiry.
Fitment depends on the frame dimensions and depth. Thesvin offers 50 mm and 70 mm depths, and standard sizes such as 305 × 610 × 50 mm, 610 × 610 × 50 mm, 1170 × 570 × 50 mm, and 1170 × 1170 × 70 mm. Check your housing’s nominal size and available depth; if you are unsure, send a photo of the old filter and the equipment model for confirmation.
Yes. A physical sample or clear photos of the old filter’s frame, gasket, and overall dimensions are often enough for Thesvin to match the interface. The engineering team can then propose a frame and media combination that reproduces the fit, including any non-standard size.
This filter is rated M6 to E11, covering medium to sub-high efficiency. It captures micron-sized particles and is typically used as a pre-filter ahead of HEPA stages or as a standalone filter in commercial HVAC. The exact grade can be selected based on your particle-size target and allowable pressure drop.
Yes. Thesvin offers OEM/ODM customisation of size, frame material (anodised aluminium or stainless steel), media grade, and packaging. Custom sizes are supported by the 20,000 m² clean workshop and CNAS-accredited testing centre. A typical custom sample can be delivered in about 2–3 weeks.
Standard sizes have a minimum order quantity of 50–100 pieces. Custom sizes typically start at 100–200 pieces, depending on structural complexity. Thesvin can discuss flexible terms for sample orders and new customers.
Standard stock items are typically delivered in 7–15 days. Custom orders usually take 25–35 days for bulk production. Thesvin maintains multiple automated lines and sufficient raw material stock to support urgent orders and long-term supply.
Replacement interval depends on operating conditions, dust loading, and airflow. In typical commercial ventilation, a service life of 6–12 months is common. Thesvin’s CNAS laboratory can provide dust-holding capacity test data to help you set a replacement schedule based on pressure drop.
Yes. Standard-size samples can be provided free of charge (1–2 pieces, freight collect). Custom samples may incur a small fee, which is refundable against a bulk order. Each sample can be supplied with a CNAS test report covering efficiency, initial resistance, and dust-holding capacity. Contact Thesvin with your requirements to arrange a sample.