Celrith Single/Double Flange Medium Efficiency Filters (E11/E12)

Celrith single and double flange medium efficiency filters are high-capacity air filters designed to capture fine particles and protect sensitive processes in HVAC, cleanroom, pharmaceutical, electronics, and industrial applications. They utilise high-performance glass fibre media and an anodised aluminium frame to deliver E11 or E12 filtration efficiency with airflow up to 2000 m³/h. These filters are ideal for facility managers, HVAC engineers, and OEMs seeking reliable particle control and leak-free installation.

The Contaminant Problem

Airborne particles—dust, pollen, smoke, microorganisms, and fine particulate matter—impose a constant burden on ventilation systems and indoor environments. In commercial buildings, these contaminants reduce air quality and can trigger allergies or respiratory discomfort. In cleanrooms and pharmaceutical production, even sub-micron particles threaten product purity and process validation. The problem is not only the presence of particles but their persistence: once inside a system, they recirculate, settle on surfaces, and accumulate in ductwork. Celrith filters address this by providing a physical barrier that captures particles before they reach critical areas, easing the load on downstream equipment and maintaining a cleaner indoor environment.

Load on Equipment and Systems

When particles penetrate an air handling system, they deposit on coils, fans, and ducts, reducing heat transfer efficiency and increasing energy consumption. Over time, this fouling leads to higher maintenance costs, more frequent cleaning, and potential system downtime. In precision environments such as semiconductor fabrication or data centres, particle contamination can cause product defects or equipment failure. Additionally, odours and gases—though not the primary target of medium efficiency filters—can combine with particles to create complex air quality issues. By intercepting particles at the medium efficiency stage, Celrith filters reduce the particulate load on high-efficiency filters, extending their service life and lowering overall operating expenses. The result is a more stable system with predictable performance and reduced risk of contamination-related incidents.

How Celrith Handles It

Celrith’s design focuses on two key challenges: filtration efficiency and installation integrity. The filters use high-performance glass fibre media that provide a high dust-holding capacity and consistent particle capture across the filter face. The anodised aluminium alloy frame is lightweight yet corrosion-resistant, ensuring structural stability under varying airflow conditions.

The single or double flange configuration is central to leak prevention. Single-flange filters suit standard duct connections, while double-flange filters feature flanges on both the upstream and downstream sides, creating a tighter seal and greater resistance to pressure differentials. This design minimises bypass leakage, a common weak point in filter installations. The filters are available in E11 and E12 efficiency grades, with rated airflows up to 2000 m³/h for the 592 × 592 × 88 mm size (E11) and 1000 m³/h for the same size in E12. Standard sizes include 287 × 592 × 88 mm and 592 × 592 × 88 mm, and custom dimensions, flange sizes, and airflow ratings can be produced on request. With Celrith, you gain a filter that not only captures contaminants but also integrates securely into your system, reducing the risk of unfiltered air bypass.

Key Specifications

Who Uses It

Celrith filters serve a diverse range of industries where air quality is critical. In commercial HVAC systems, they provide reliable particle removal for offices, shopping malls, and public buildings. In semiconductor and microelectronics manufacturing, they protect sensitive processes from particle contamination. Hospitals and cleanrooms rely on them for operating theatres and isolation rooms. Pharmaceutical and food processing facilities use them to maintain sterile conditions. Automotive and mechanical manufacturing plants deploy them in paint booths and engine assembly areas. Data centres and energy storage facilities benefit from their high airflow capacity and stable performance. Across all these sectors, users value the filters’ combination of efficiency, durability, and ease of installation.

Supply Assurance and Credentials

Celrith products are manufactured in a 50,000 m² facility in Zhongshan, Guangdong, China, which includes 20,000 m² of cleanroom space across six workshops. The company holds ISO 9001, ISO 14001, and ISO 45001 certifications, and has been IATF 16949 certified since 2024. Products comply with REACH and RoHS regulations, and compliance documentation is available upon request. The in-house laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust-holding capacity, and pressure drop. With over 20 years of experience in filtration and exports to Europe, the US, Japan, and South Korea, Celrith supports OEM/ODM projects with custom sizes, structures, media grades, frame materials, logos, and packaging. Multiple automated production lines enable monthly output in the millions of units, and IQC, IPQC, and OQC processes ensure consistent quality from incoming materials to final shipment.

Talk to Us

To receive a tailored quote for Celrith single/double flange medium efficiency filters, please provide the following details: your device or vehicle model (if applicable), required dimensions or a drawing, airflow or water flow rate, operating conditions (temperature, humidity, contaminant type), and estimated quantity. Our engineering team will respond promptly with a recommendation and quotation. Contact us today to discuss your filtration requirements.