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This is a metal-frame pre-filter built around a polyester fiber non-woven medium, supplied by Ranveth with a separable double-frame design. It captures coarse dust, hair, lint and fiber before they reach coils, ducts or downstream fine filters. It suits facility and maintenance teams running central air conditioning, fresh-air intakes, high-humidity exhaust lines and air handling units, and buyers who want to replace media rather than whole filter assemblies.
The medium is a high-toughness polyester fiber non-woven chosen for two properties that matter most in a pre-filter position: it holds its structure when loaded, and it keeps working at high moisture. The fiber web is the working layer; the metal frame is the support structure that keeps that web flat and evenly spaced across the duct face. Read the two together, because each one sets a different limit.
When the medium and frame are matched well, air passes through an even, stable face area. That keeps initial resistance predictable and lets dust build up across the whole medium rather than in one loaded patch. A pre-filter that loads evenly tends to reach its change-out point later than one that blinds early in a single zone, and it protects the coil or the next filter stage for longer.
The double-frame design separates the outer frame from the inner media frame. In practice this means the structural part stays on the unit and the loaded media section is the part that gets swapped. Buyers who have been discarding complete framed panels can move to media-only replacement and cut consumable cost per change. The frame is offered in aluminum profile, galvanized or plastic, so the same build logic can be specified to suit the housing and the budget.
Operating limits are stated rather than implied: a maximum running temperature of 50°C and a maximum running relative humidity of 100%. Those figures define where the polyester medium and frame combination should be applied, and they are the two conditions worth checking against your duct before ordering.
| Item | Detail |
|---|---|
| Product name | Metal double-frame primary filter |
| Core filter medium | High-toughness polyester fiber, resistant to high humidity |
| Frame material options | Aluminum profile, galvanized, or plastic |
| Maximum operating temperature | 50°C |
| Maximum operating relative humidity | 100% |
| Common thickness options | 46 mm / 69 mm / 96 mm (approximately 2 in, 3 in, 4 in) |
| Core applications | Pre-filtration for central air conditioning in factory workshops, high-humidity exhaust environments, fresh-air intakes for cleanrooms, air handling units (AHU) |
| Reference standard sizes (W × H × T, mm) | 594 × 289 × 46 / 69 / 96; 594 × 492 × 46 / 69 / 96; 594 × 594 × 46 / 69 / 96 |
| Customisation (OEM/ODM) | Non-standard sizes and frame thicknesses fully supported; 50,000 m² plant and CNAS-accredited laboratory; ISO and IATF 16949 certified |
The most common position is the pre-filter stage of a central air conditioning system in commercial and industrial buildings, where the filter takes the first load of coarse dust before the coil and the downstream stages. Fresh-air intakes on cleanroom air handling units use the same build, because the medium tolerates the humidity that often comes with incoming outdoor air.
In high-humidity exhaust lines the 100% relative humidity rating is the reason this medium is specified rather than a standard synthetic web. In data center and semiconductor spaces, the filter is normally the first stage ahead of finer filtration, protecting the more expensive stages behind it.
Custom sizes and frame thicknesses are supported as standard practice, not as an exception. To quote accurately, we ask for the following:
With those details we can confirm whether a standard size fits or whether a made-to-size frame is the better route.
Media choices here are backed by measurement. Our in-house laboratory holds CNAS (China National Accreditation Service for Conformity Assessment) accreditation and can issue test reports covering filtration efficiency, dust holding capacity and resistance, so the polyester medium and frame pairing can be checked against the duty you describe.
Production runs in a 50,000 m² plant in Zhongshan, Guangdong, including six cleanrooms totaling 20,000 m². The quality system is certified to IATF 16949 (obtained in 2024) alongside ISO 9001, ISO 14001 and ISO 45001, with IQC, IPQC and OQC checks through the process. Products meet REACH and RoHS requirements and compliance documents can be supplied.
Ranveth draws on more than 20 years of filter development and manufacturing, with continuous export to Europe, the United States, Japan and Korea over that period. OEM and ODM work covers size, structure, media grade, frame material, logo and packaging, and more than 1,000 filter solutions have been developed to date. Multiple automated lines support monthly output in the millions of pieces.
Send the device or vehicle model, the size or drawing, the airflow or water flow, the operating conditions and the quantity you expect. We will come back with a specification, sample arrangement and price. Contact our team to start.
It uses a high-toughness polyester fiber non-woven medium held in a separable double frame. The frame is available in aluminum profile, galvanized or plastic. The split design means the structural frame stays on the unit while the loaded media section is the part replaced.
It is a primary (pre) filter that intercepts coarse dust, hair, lint and fiber, and it is normally placed ahead of finer stages. It protects coils, ductwork and downstream filters from the first dust load. For efficiency figures on a specific build, ask us for a CNAS laboratory test report.
Yes. Non-standard sizes and frame thicknesses are fully supported. Standard reference sizes are 594 × 289, 594 × 492 and 594 × 594 mm in 46, 69 or 96 mm thickness, and other dimensions are built to drawing. Send the housing drawing or slot dimensions and we will confirm the build.
The maximum running temperature is 50°C and the maximum running relative humidity is 100%. Those limits come from the polyester medium and frame combination. Check both against your duct conditions before ordering, particularly on exhaust lines.
Send the device or AHU model, size or drawing, airflow, operating conditions and quantity. We will confirm the specification and quote against it, and arrange samples for evaluation. Custom builds are quoted once the drawing is agreed.
Standard sizes start at 500 pieces; custom sizes generally start at 1,000 pieces, and both can be discussed against the project. Standard orders run 15–25 days and custom orders 25–35 days. Production is scheduled at our Zhongshan plant.
Under normal conditions the service life is about 2–3 months, depending on the cleanliness of the site air, the airflow and the running hours. Because the frame separates from the media section, change-outs normally involve the media only. Set the interval from your own pressure rise data.
The plant holds IATF 16949 (obtained in 2024), ISO 9001, ISO 14001 and ISO 45001, and products meet REACH and RoHS requirements with compliance documents available. Our in-house laboratory is CNAS-accredited for efficiency, dust holding capacity and resistance testing. If you need documentation for a project, ask us through the contact page.
