Thesvin Flat Panel HEPA Filter — MAX Series Thin Panel Filter

The Thesvin Flat Panel HEPA Filter (MAX Series) is an ultra-thin flat panel HEPA filter built to sit inside tight equipment envelopes such as air purifiers, dehumidifiers and robot exhaust ducts. It removes sub-micron particulate from the airstream, with efficiency determined by the media grade selected, from E11 up to H14/U15. It is made for appliance and equipment manufacturers, OEM/ODM brand owners and HVAC integrators who need the filter to match an existing housing rather than adapt the housing to a standard canister. Thesvin manufactures it in Zhongshan, Guangdong, China.

Fitment and Interface

The MAX series is defined by its flat profile: a low-resistance panel that uses the space available rather than a deep pleated pack. That matters where the filter is a design constraint — inside a tabletop purifier, a combined humidifier-purifier, a dehumidifier or the exhaust path of a robot vacuum, the filter thickness, outline and sealing face decide how much product space is left for the fan, duct and electronics.

Because every unit is made to the customer's drawings, fitment is treated as a dimensional and sealing problem first. The panel outline, thickness and encapsulation process are produced to the host design, so the filter seats against the surface the equipment provides. Thesvin's engineering team works from your whole-machine drawing to set the panel geometry and the way the edge is encapsulated, then confirms the result against the housing interface before performance targets are locked in.

From a structural standpoint, a flat panel has to stay flat. An uneven or over-thick panel will not seat, and a panel that deflects under airflow can bypass at the perimeter. The MAX series addresses this through the flat construction itself and through process control on the encapsulated edge, which is why dimensional checks are part of the IQC, IPQC and OQC sequence rather than a final visual pass. If your unit has an existing filter pocket, gasket land or retention feature, send that geometry and the panel will be built to it.

What It Filters

The MAX series captures sub-micron particles from the air passing through the panel. Media choice drives both what the filter does and how it behaves in service. The available options are PP (polypropylene melt-blown), PP+PET composite moisture-resistant media, and PTFE membrane.

• PP melt-blown: a general-purpose HEPA media suited to volume appliance programmes where cost and consistent resistance matter.
• PP+PET composite: a moisture-resistant option for humidifier-purifiers, dehumidifiers and other units that see damp air.
• PTFE membrane: chosen where the highest efficiency grades and low resistance are both required.

Efficiency follows the media grade, spanning sub-high-efficiency (E11) through ultra-high-efficiency (H14/U15). Resistance and dust holding capacity are balanced through a low-initial-resistance design that keeps a large dust load capacity, which extends service life between replacements. The result is a panel that filters fine particulate without imposing avoidable pressure drop on a small blower.

Dimensions and Technical Data

The table below summarises the published specification. Dimensions and encapsulation are made to your drawing; the figures shown are the programme parameters, not a fixed catalogue size.

Three Steps to the Right Part

1. Send the interface geometry. Provide the whole-machine drawing, the filter pocket dimensions or the old part. Include outline length and width, panel thickness, and any sealing or retention features the housing uses. A physical sample is often faster than a drawing for retrofits.
2. State the duty. Give the airflow the unit moves, the expected operating conditions (humidity, temperature, dust loading), the efficiency grade you need and the pressure drop budget your blower can accept. This is what determines the media selection among PP, PP+PET and PTFE.
3. Approve the sample, then set the order. Thesvin builds a sample against your geometry and duty, you validate fit and performance in the unit, and production quantities follow the approved sample.

Delivery and Quality Assurance

Dimensional consistency is the core of panel filter quality, because a filter that does not seat is a filter that bypasses. Thesvin holds IATF 16949 certification, obtained in 2024, and runs IQC, IPQC and OQC control across the production flow so that incoming media, in-process encapsulation and outgoing panels are each checked against specification.

The company's own laboratory is accredited by CNAS (China National Accreditation Service for Conformity Assessment) and can issue test reports covering filtration efficiency, dust holding capacity and resistance. The manufacturing site covers 50,000 m², of which six clean workshops account for 20,000 m². The plant operates under ISO 9001, ISO 14001 and ISO 45001 management systems, and products meet REACH and RoHS requirements with compliance documentation available. With more than 20 years of filtration development and manufacturing, and continued exports to Europe, the United States, Japan and South Korea for over 20 years, Thesvin has built more than 1,000 filtration solutions. Multiple automated production lines support output in the millions of pieces per month. OEM/ODM covers size, structure, media grade, frame material, logo and packaging. The factory is located in Zhongshan, Guangdong, China.

Send Thesvin Your Drawing or Old Part

To get a quotation for the MAX series flat panel HEPA filter, send the device or vehicle model, the panel size or drawing (an old part is acceptable), the airflow or water flow of the unit, the operating conditions, and the quantity you expect to order. The engineering team will confirm media grade and encapsulation and return a proposal. Contact Thesvin to start.