Dust Filter Box (HEPA Grade) for Ventilators and Respirators

Oltaven's Dust Filter Box (HEPA Grade) is a finished filter assembly that combines a high-precision PTFE microporous membrane, glass fibre media and composite activated carbon to capture PM0.3 particles at an efficiency of ≥ 99.99% while adsorbing VOCs. It is built for clinical ventilators and anaesthesia machine circuits, industrial respirators and positive-pressure breathing apparatus, and high-specification fresh-air and oxygen-generation equipment. Oltaven supplies the completed filter — pleated, framed, sealed and tested — rather than loose media, so the efficiency, resistance and capacity you specify are the ones you receive.

From Media to Finished Filter

A filter medium is only a starting point. The same PTFE membrane can end up as a high-efficiency, low-resistance cartridge or as a restrictive panel, depending on how it is pleated, supported and framed. Oltaven builds the Dust Filter Box as a complete assembly: the media is folded to a defined pleat geometry, held in a moulded ABS or PC housing produced to the customer's drawing, and closed with an ultrasonic-welded medical silicone seal so that air cannot bypass the filter face.

That last step matters as much as the media itself. An unsealed edge lets unfiltered air slip past the pleats, and the measured efficiency of the assembly then falls below the rating of the material inside it. By treating forming and sealing as part of the product — not as packaging around it — Oltaven can state the performance of the finished box and stand behind it in the application.

What Decides Finished Performance

Three outcomes matter to a device designer: how much is captured, how hard the air has to be pulled through, and how long the filter lasts before it loads up. Each is set by a different part of the build.

Efficiency

Efficiency is governed first by the medium grade. The Dust Filter Box uses a high-precision PTFE microporous membrane, top-grade glass fibre and composite activated carbon. The PTFE membrane delivers the PM0.3 removal rate of ≥ 99.99%, while the activated carbon layer adds adsorption of VOC gases — particle interception and gas-phase control in one element. Extended levels are available, including HEPA H13 and H14 media, so a customer can match the grade to the clinical or industrial requirement rather than over-specifying.

Resistance

Resistance comes from pleat count, pleat depth and the open area of the housing. More pleats in the same footprint spread the airflow over more media, lowering face velocity and pressure drop — but pack them too tightly and the pleats mask each other. Oltaven balances media area against the airflow the device can deliver, then verifies the result on the finished assembly.

Capacity

Capacity is the dust the filter can hold before resistance rises too far. Deeper pleats and a larger media area raise capacity; a well-sealed frame keeps all incoming air passing through the media so that the whole face shares the load. Because Oltaven moulds the housing to the customer's drawing, the internal volume can be sized to the service interval the device requires.

Applications

The Dust Filter Box is used where both particles and gases must be controlled in a breathing or air-supply path:

• Clinical ventilators and anaesthesia machine circuits — protection of the breathing path from dust, pollen, PM2.5 and microbial particles.
• Industrial respirators and positive-pressure breathing apparatus — combined particle and VOC control for the wearer.
• High-specification fresh-air purification and oxygen-generation equipment — intake filtration where a compact, sealed cartridge is required.

Because the housing is produced to customer drawings, the same filter concept can be adapted to different device interfaces without changing the media strategy.

Technical Specifications

The Oltaven Factory and Certifications

Oltaven is a filter manufacturer with more than 20 years of development and production experience and over 1,000 filter solutions developed to date. OEM/ODM work is core to what we do: dimensions, structure, media grade, frame material, logo and packaging can all be customised, and we hold the tooling and process knowledge to take a drawing through to a finished cartridge.

The production base covers 50,000 m², including six cleanrooms totalling 20,000 m², where media slitting, pleating, assembly and packing for HEPA medical filter boxes are carried out to limit secondary contamination. An in-house CNAS-accredited laboratory verifies filtration efficiency, dust-holding capacity, resistance and other key parameters and can issue test reports with shipments. The company holds IATF 16949 (obtained in 2024), ISO 9001, ISO 14001 and ISO 45001 system certification, and products meet REACH and RoHS requirements with compliance documents available. Quality control runs through IQC, IPQC and OQC, and automated lines support monthly output in the millions of pieces. The company is located in Zhongshan, Guangdong, China, and has exported to Europe, the United States, Japan and Korea for more than 20 years.

OEM/ODM Workflow

1. Requirement review — you share the device model, drawing or sample, target efficiency grade and airflow.
2. Media and structure proposal — Oltaven selects the media grade (including H13/H14 where required) and proposes the housing, pleat geometry and sealing method.
3. Sampling — custom samples are typically available within 7–15 days depending on development complexity.
4. Validation — efficiency, resistance, dust-holding capacity, airtightness and structural strength are checked at the CNAS laboratory; reports can accompany the shipment.
5. Tooling and production — moulds are opened to your drawing, then batch production runs under GMP and IATF 16949 process control.
6. Packing and delivery — logo, colour box, blister or neutral packaging to your specification.

Start a Custom Project

To quote accurately, tell us the device or vehicle model the filter fits, the size or a drawing, the airflow or water flow the system delivers, the operating conditions, and the quantity you expect per order or per year. With those details Oltaven can recommend a media grade and housing design and confirm MOQ, sample timing and lead time. Contact our team to begin.