Gel Seal HEPA & ULPA Filter (H12–U15) — Zanxis

Direct Answer

The Zanxis gel seal HEPA & ULPA filter is a high-efficiency pleated panel filter with a polyurethane gel seal, built for cleanrooms and equipment that cannot tolerate bypass leakage. It removes particles down to the MPPS range at H12, H13, H14, or U15 efficiency, using high-throughput, moisture-resistant ultra-fine glass fibre media in an anodised aluminium frame. It is supplied in top-gel-seal and side-gel-seal formats for semiconductor wafer fabs, GMP pharmaceutical suites, hospital operating rooms, FFU units, and high-spec paint lines. If you are qualifying a filter for an audit, the first step is agreeing which values on the table below you will verify, and how.

Parameter Table

Values Worth Confirming

Before a purchase order, a QA engineer usually wants four numbers pinned down. First, the efficiency class and the particle size it refers to: H13 and H14 are stated against 0.3 µm in our documentation, and U15 is a ULPA class, so the test basis should be written into the specification, not assumed. Second, the rated airflow at which that efficiency is declared — the standard sizes above are rated at 1,000, 1,800, 750, and 1,300 m³/h respectively, and a filter run well above its rated airflow will not hold the same resistance or service life. Third, initial resistance at that airflow, which sets the fan or FFU duty. Fourth, the gel channel dimensions and frame depth, because a 50 mm side-seal filter and a 70 mm top-seal filter are not interchangeable in the same housing.

It is also worth confirming what the filter is not asked to do. The gel seal controls bypass at the frame-to-housing interface; it does not replace correct housing alignment or a clean knife edge. Where a project specifies a maximum final resistance, agree that figure with us at quotation stage so the replacement trigger is unambiguous.

Sample Verification Workflow

1. Define the verification sheet. List the class, test aerosol and particle size basis, rated airflow, and the resistance limit you will accept. Send it with your drawing or housing dimensions.
2. Receive the sample and its paperwork. Each unit carries a unique number that links it to its production batch and test data, so the report you receive refers to the filter in the box.
3. Check dimensional fit first. Measure frame depth, gel channel width, and overall dimensions against your housing drawing before any airflow test; a dimensional mismatch invalidates later results.
4. Run the efficiency and resistance check. Test at your declared airflow, record initial resistance, and compare the efficiency result with the class on the label.
5. Sign off or raise a deviation. If a value falls outside your sheet, return the data with the sample number; deviations are traced to the batch rather than handled case by case.
6. Freeze the specification. Once signed off, the approved sample and its values become the reference for production and for incoming inspection at your site.

Construction and Use

The filter uses ultra-fine glass fibre media selected for high throughput and resistance to moisture, pleated into an anodised aluminium profile frame. The seal is a polyurethane gel — a firm, elastic bead that seats into the mating knife-edge channel of the housing. Two formats are offered: side gel seal in 50 mm frame depth, and top gel seal in 70 mm depth. The side-seal 610×610×50 mm unit is rated at 1,000 m³/h and the 1170×570×50 mm at 1,800 m³/h; the top-seal 610×610×70 mm is rated at 750 m³/h and the 1170×570×70 mm at 1,300 m³/h. High-airflow specifications up to 3,600 m³/h are supported.

Typical duty is terminal filtration in semiconductor wafer fabrication cleanrooms, biopharmaceutical GMP workshops, class 100 hospital operating rooms, FFU purification equipment, and high-standard coating lines. In each case the filter is the last stage, so upstream pre-filtration matters: coarse and medium stages protect the HEPA or ULPA element and extend the interval between changes. When replacing, seat the new frame squarely into the gel channel and confirm the gel is continuous around the perimeter before restoring airflow. Do not clean and reuse the media.

Testing and Systems at Zanxis

Zanxis operates its own laboratory accredited by CNAS (China National Accreditation Service for Conformity Assessment), which issues reports covering filtration efficiency, dust holding capacity, and resistance. Those three values are the ones most often requested at tender stage, and they can be supplied against the specific unit number.

Quality control runs through the whole order: incoming inspection of media and frame material (IQC), in-process checks during pleating, sealing, and assembly (IPQC), and outgoing inspection before packing (OQC). The company holds ISO 9001, ISO 14001, and ISO 45001 certification, and obtained IATF 16949 automotive quality management certification in 2024. Products meet REACH and RoHS requirements, and compliance documents are available on request.

Manufacturing takes place on a 50,000 m² site in Zhongshan, Guangdong, China, including six cleanrooms totalling 20,000 m², where final assembly of high-efficiency filters is carried out. With more than 20 years of filter development and manufacturing experience and over 1,000 filtration solutions developed, the company exports to Europe, the United States, Japan, and South Korea, and supports OEM/ODM customisation of dimensions, structure, media class, frame material, logo, and packaging.

Request Samples and Test Reports

To quote accurately and to prepare the right sample, we need five pieces of information: the device or FFU/housing model, the size or a drawing (including frame depth and gel channel), the airflow you will run at, the operating conditions (temperature, humidity, upstream filtration), and the quantity for the trial and for series supply. Send these through the contact page and we will confirm the class, the test basis, and the sample and production schedule against your verification sheet.