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Contact The Oltaven metal frame non-woven fabric pre-filter is a coarse-grade air filter built on a two-part metal frame and a high-toughness polyester fiber medium. It captures large dust…
FILTER MEDIA / ROLLS · SHEETS · DIE-CUT
The Oltaven metal frame non-woven fabric pre-filter is a coarse-grade air filter built on a two-part metal frame and a high-toughness polyester fiber medium. It captures large dust particles, hair and fibers in air handling units, fresh-air intakes and high-humidity exhaust systems. It is made for HVAC engineers, facility managers and OEM buyers who want a durable first-stage filter that protects downstream equipment and can be renewed at lower cost.
A filter is more than its media. The same polyester non-woven can behave very differently once it is pleated, framed and sealed. At Oltaven we sell finished filters, so every step from media selection to final assembly is controlled in our plant. The medium is a high-toughness polyester fiber chosen for moisture resistance. It is formed into a pleated pack to create surface area, then bonded to a metal or plastic frame. The frame holds the pack flat under airflow, and the seal prevents air from bypassing the medium. Each decision changes efficiency, resistance and dust-holding capacity in the finished product.
The polyester fiber medium sets the baseline. Its fiber structure and thickness determine how easily air passes and how much dust it can hold. Because the medium is designed to tolerate high humidity, the filter keeps its shape in damp exhaust streams where paper-based media might soften.
Pleat height and pleat spacing control the balance between surface area and pressure drop. More open pleats lower resistance but reduce the amount of medium available for dust loading. Our forming process fixes the pleat geometry so the pack stays uniform across the frame.
The frame is not just a holder. A rigid aluminum, galvanized or plastic frame keeps the pleat pack flat and resists wind pressure. The seal between medium and frame closes gaps that would let unfiltered air slip past. Our two-part frame design separates the outer frame from the inner filter pack: when the medium is loaded, the pack can be replaced while the outer frame stays in place. This reduces consumable cost compared with replacing the whole filter.
The filter is used as a first stage in commercial air conditioning and ventilation systems, in pharmaceutical and food processing areas, in automotive and machinery plants, in energy and metal smelting facilities, in energy storage installations, in AI computing and data centers, and in semiconductor and microelectronics fabs. Typical positions include central air handling unit pre-filters in factory workshops, high-humidity exhaust air paths, fresh-air intakes for cleanrooms and general AHU protection. In each case the goal is the same: capture coarse contaminants before they reach coils, ducts or higher-efficiency filters.
| Item | Detail |
|---|---|
| Product name | Metal double-frame primary filter |
| Filter medium | High-toughness, humidity-resistant polyester fiber |
| Frame material | Aluminum profile, galvanized steel or plastic frame (optional) |
| Maximum operating temperature | 50 °C |
| Maximum operating relative humidity | 100% |
| Standard thicknesses | 46 mm / 69 mm / 96 mm (approximately 2 in, 3 in, 4 in) |
| Common standard sizes (W × H × T, mm) | 594 × 289 × 46 / 69 / 96 594 × 492 × 46 / 69 / 96 594 × 594 × 46 / 69 / 96 |
| Customisation | OEM/ODM supported for non-standard sizes and frame thicknesses |
Oltaven is built around OEM/ODM capability. We have developed more than 1,000 filtration solutions for customers, and our team supports custom sizes, structures, media grades, frame materials, logos and packaging. Production runs in a 50,000 m² plant in Zhongshan, Guangdong, China, which includes six cleanrooms totalling 20,000 m². Our own laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust-holding capacity and resistance. The plant holds IATF 16949 automotive quality certification (obtained in 2024) as well as ISO 9001, ISO 14001 and ISO 45001. Products meet REACH and RoHS requirements, and compliance documents are available. With more than 20 years of filtration experience and continuous exports to Europe, the United States, Japan and South Korea, we control quality through IQC, IPQC and OQC at every stage.
To receive a quotation, please tell us your device or vehicle model, the size or drawing, the airflow or water flow, the operating conditions (temperature, humidity, contaminants) and the quantity you plan to order. Our team will respond with a proposal and lead time. Contact Oltaven to start the conversation.
Resistance depends on the medium, pleat geometry and how well the filter is sealed. A denser medium or tighter pleats increase resistance, while a more open pleat pattern lowers it. The frame and seal also matter: a poor seal lets air bypass the medium, which can lower measured resistance but also reduce efficiency. Oltaven controls these variables in production to deliver consistent performance.
The filter is designed to meet EN779 G3/G4 (ISO 16890 Coarse) efficiency for particles ≥5 μm. It captures large dust, hair and fibers, making it suitable as a pre-filter ahead of higher-efficiency stages. Actual efficiency depends on the medium grade and frame thickness selected for your project.
An OEM project starts with your requirements: device or system model, size or drawing, airflow, operating conditions and target quantity. We review these and propose a medium, frame and thickness. Custom samples are typically ready in 7–10 days for your validation before volume production.
Yes. For B2B customers with a clear purchase intention, we provide standard-size samples free of charge; you cover international courier cost. Custom samples incur a small tooling fee, which can be credited against volume orders. Quotes include lead time and are based on your specifications.
Standard sizes typically start at 500 pieces; custom specifications generally start at 1,000 pieces, negotiable based on the project. Standard orders ship in 15–25 days, while custom orders take 25–35 days. Our Zhongshan plant and automated lines allow flexible scheduling.
Under normal conditions, replacement is about every 2–3 months, depending on site air cleanliness, airflow and running hours. Because the two-part frame lets you replace only the filter pack, you can extend the life of the outer frame and reduce consumable cost. Monitor pressure drop to set the right interval.
The plant holds IATF 16949 (2024), ISO 9001, ISO 14001 and ISO 45001, and products meet REACH and RoHS requirements. Our CNAS-accredited laboratory can provide test reports for efficiency, resistance and dust-holding capacity. These documents support market entry and quality verification.
Yes, the polyester fiber medium is designed for high humidity, and the filter is rated for up to 100% relative humidity at temperatures up to 50 °C. This makes it suitable for damp exhaust streams where standard media might degrade. For specific conditions, share your operating data and we will confirm suitability.