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This Ranveth bag filter is an air filter that captures particles in HVAC, cleanroom, and industrial supply-air systems. It uses non-woven synthetic fiber or flame-retardant fiberglass media in a multi-pocket build, available from G4 pre-filter through F9 medium-efficiency grades. It is made for facility engineers, HVAC contractors, and OEM buyers who need predictable efficiency, low airflow resistance, and long service life in commercial and industrial ventilation.
The performance of a bag filter comes from how the media and the pocket structure work together. Ranveth pairs high-throughput non-woven fiber with a graduated layer build that traps larger particles on the surface while finer fibers deeper in the media capture smaller particles. This graded structure gives a high dust-holding capacity without a sharp rise in pressure drop, so the filter keeps its airflow longer between changes.
For higher efficiency grades, flame-retardant fiberglass media is used. The glass fibers are arranged to create a dense but permeable matrix that supports F7 to F9 performance while maintaining structural integrity under airflow. The media is assembled into pockets that unfold evenly, keeping the filter face open and reducing turbulence. The pocket count and depth are matched to the frame size so that the ratio of media area to face area stays consistent, which helps control face velocity and pressure drop.
The frame is made of aluminum or galvanized steel, chosen for rigidity and resistance to corrosion. The combination of a stiff frame and fully extended pockets prevents pocket collapse at the rated 2.5 m/s face velocity, protecting the media from mechanical damage and maintaining a stable filter profile. This pairing of media and structure is what drives the filter's efficiency, airflow resistance, and service life.
| Item | Detail |
|---|---|
| Filter grade | G4 / M5 / M6 / F7 / F8 / F9 (pre-filter to medium efficiency) |
| Media | High-throughput non-woven fiber or flame-retardant fiberglass |
| Frame material | Aluminum or galvanized steel |
| Rated operating face velocity | 2.5 m/s |
| Standard sizes (W × H × D) | 594 × 594 × 534 mm (24"×24"×21") – typically 6 / 8 / 10 pockets 594 × 492 × 534 mm (24"×20"×21") – typically 6 / 8 pockets 289 × 594 × 534 mm (12"×24"×21") – typically 3 / 4 pockets Other depths such as 381 mm (15") are available |
| Core applications | Central HVAC pre-filtration in commercial buildings, cleanroom fresh-air systems, HVAC filtration in electronics, pharmaceutical, and coating plants |
| Customisation (OEM) | Non-standard sizes and pocket counts fully supported, backed by 20 years of manufacturing experience and a CNAS-accredited testing center |
Ranveth bag filters are typically installed as pre-filters or medium-efficiency filters in air handling units, fresh-air systems, and return-air ducts. In commercial buildings, they protect cooling coils and downstream high-efficiency filters from dust loading, which helps maintain system efficiency and reduce maintenance frequency.
In cleanrooms for semiconductors, microelectronics, and healthcare, they serve as the first or second filtration stage, extending the life of terminal HEPA filters. Pharmaceutical and food processing facilities use them to control particulate contamination in production areas. Automotive and machinery manufacturing plants rely on them for paint booth supply air and general ventilation. Energy and metal smelting operations use them in harsh environments where dust loads are high, and data centers and energy storage facilities use them to keep cooling air clean and protect sensitive electronics.
The choice of grade depends on the required air quality and the dust concentration in the space. G4 and M5 grades are common for general ventilation, while F7 to F9 grades are used where finer particles must be controlled, such as in cleanroom pre-filtration or hospital air handling.
To specify a custom bag filter, please provide the following information:
With these details, our engineers can recommend the appropriate media, pocket count, and frame material, and provide a quote. We also support OEM customisation of logos and packaging for distributors and brand owners.
Ranveth is a filter manufacturer based in Zhongshan, Guangdong, China, with more than 20 years of experience in filtration product development and manufacturing. Our in-house laboratory is CNAS-accredited, meaning we can issue test reports for filtration efficiency, dust-holding capacity, and pressure drop. This allows us to validate media choices and back our specifications with measured data.
Our production base covers 50,000 m², including six cleanrooms totaling 20,000 m². We are certified to IATF 16949 (2024), ISO 9001, ISO 14001, and ISO 45001, and our products meet REACH and RoHS requirements. We have developed over 1,000 filtration solutions and export to Europe, the United States, Japan, and South Korea. Our quality control follows IQC, IPQC, and OQC processes, and our automated production lines support monthly capacity in the millions of pieces.
We welcome sample requests for testing and evaluation. Standard sizes can be provided as free samples with freight paid by the customer; custom samples may incur a development fee that is credited against a bulk order. Each sample comes with a test report from our CNAS-accredited laboratory.
To request a quote or discuss a custom build, please contact our team with your specifications. We will respond with recommendations, pricing, and lead time. Our team is ready to assist with selection and custom engineering.
Ranveth bag filters use high-throughput non-woven fiber or flame-retardant fiberglass media, paired with a multi-pocket structure. The non-woven fiber provides high dust-holding capacity for G4 to F9 grades, while fiberglass is used for higher-efficiency F7 to F9 grades where flame retardancy and finer particle capture are required.
The filter is available in G4, M5, M6, F7, F8, and F9 grades. Lower grades like G4 and M5 are typically used for pre-filtration and general ventilation, while F7 to F9 provide finer particle removal for cleanroom and healthcare applications. Efficiency grade selection should match the target air quality and dust load.
Yes, we fully support custom sizes and pocket counts. Standard sizes range from 289×594×534 mm to 594×594×534 mm with 3 to 10 pockets, but we can manufacture non-standard dimensions and pocket arrangements based on your drawings or samples. Our 20 years of experience and CNAS lab allow us to tailor media and frame to your requirements.
For standard specifications, the MOQ is typically 100–200 pieces. Custom specifications have a negotiated MOQ. Standard orders ship in 15–25 days, while large or highly customised orders take about 30–45 days. Our Zhongshan plant has ample monthly capacity to support stable delivery.
Under standard HVAC conditions with a face velocity of 2.5 m/s, the filter typically lasts 6–12 months, depending on air quality and operating hours. We recommend monitoring pressure drop and replacing when it reaches the recommended final resistance. Each batch is tested for efficiency, pressure drop, and dust-holding capacity to ensure consistent performance.
Yes, we provide free samples for standard sizes, with the customer covering international freight. Custom samples may incur a development fee, which is credited against a bulk order. Each sample includes a performance test report from our CNAS-accredited laboratory for your evaluation.
Yes, we offer full OEM/ODM services including custom logos, labels, colour boxes, and packaging. Our team can also optimise packaging for export to reduce shipping costs. With over 1,000 filtration solutions developed, we can meet private-label requirements for distributors and brand owners.
Please provide the device or system model, required dimensions or a drawing, airflow rate, operating conditions (temperature, humidity), and quantity. Our engineers will recommend the appropriate media and pocket configuration and provide a quotation. Contact us via our <a href="/en/contact">contact page</a> to get started.