Ranveth Gas Filter Box for Ventilators – PTFE HEPA with VOCs Adsorption

Ranveth Gas Filter Box is a ventilator and respirator cartridge that pairs a high-precision PTFE membrane with glass fibre and activated carbon to remove PM0.3 particles at ≥99.99% efficiency while adsorbing VOCs. It is built for clinical ventilator and anaesthesia circuits, industrial respirators, and high-spec fresh-air or oxygen equipment. The design logic is simple: match each medium to the job it does best, then stack them so airflow stays low-resistance and service life stays predictable.

Media Pairing and Layer Build

Every Ranveth gas filter box starts with the media stack, not the housing. The core is a high-precision PTFE microporous membrane. PTFE gives a very fine pore structure at a relatively low pressure drop, which is why it can hold ≥99.99% removal efficiency for PM0.3 particles without turning the circuit into a bottleneck. Behind the membrane, a layer of top-grade glass fibre supports the fine filtration duty and adds depth loading capacity, so the filter does not blind off the moment it meets a dust or aerosol load.

The third functional layer is a composite activated carbon adsorption medium. This is where the box earns the “gas filter” part of its name: the carbon layer adsorbs and neutralises VOCs and odorous gases that pass through the particle filter. Because the carbon sits behind the particle media, the membrane protects it from coarse contamination, and the carbon protects the patient or user from volatile carry-over. The result is dual-action filtration in one cartridge: particles first, gases second, with each layer doing the job it was selected for.

Pairing also drives airflow resistance and service life. A membrane-only cartridge may filter well but load quickly; a carbon-only cartridge may adsorb gases but pass fine aerosols. By combining them in a defined order, Ranveth keeps resistance within the intended operating window for ventilator and respirator blowers, and extends usable life because each layer protects the next. The same pairing logic lets us offer HEPA H13/H14 through ULPA U15 and above, plus washable options, without changing the basic architecture.

Specification Sheet

Where It Is Used

The clinical use case is the breathing circuit. Ranveth gas filter boxes are specified for ventilator and anaesthesia machine circuits where both particle and gas control matter, and for oxygen generation equipment that needs clean, low-resistance air. In these settings the cartridge sits between the device and the patient, so the sealing ring and housing material matter as much as the media: the medical silicone ultrasonic-welded seal is there to prevent leakage at the connection.

Industrial use follows the same logic. Positive-pressure respirators and gas masks benefit from the combined particle and VOC layer when the environment carries both aerosols and volatile organic compounds. High-spec fresh-air purification is the third setting: where a compact cartridge must deliver HEPA-class particle removal and odour control without excessive pressure drop. Because the housing is injection-moulded to drawing, the same media stack can be packaged for different device interfaces, from clinical circuits to industrial mask fittings.

What to Send Us for a Custom Build

Custom builds are quoted from a short technical brief. Send the device or vehicle model the cartridge is intended for, and a size drawing or interface sketch if you have one. Tell us the airflow or water flow the system expects, and the operating conditions: temperature, humidity, expected contaminant load, and whether the environment carries VOCs as well as particles. State the quantity you plan to order, and whether you need a standard HEPA grade or an ULPA configuration, or a washable variant. If you already have a target efficiency or pressure-drop window, include it. With those inputs we can pair media and propose a layer build rather than simply quoting a stock part.

For projects that need a new housing, we tool to your drawing and can supply non-toxic medical-grade ABS/PC shells and medical silicone ultrasonic-welded sealing rings. Logo, packaging and documentation can be customised as part of an OEM/ODM programme. If you are still at the specification stage, send the device parameters and we will propose a media combination and a test plan.

Why Source from Ranveth

The first reason is test-backed media selection. Ranveth’s own laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust holding capacity and resistance. When we propose a PTFE and carbon pairing, it is because the combination has been measured, not assumed. That matters in ventilator circuits, where a small change in resistance or efficiency is a clinical variable.

The second is manufacturing scale and cleanliness. The production base covers 50,000 m², including six cleanrooms totalling 20,000 m².The company holds IATF 16949 (achieved in 2024) and ISO 9001, ISO 14001 and ISO 45001 system certificates, and products meet REACH and RoHS requirements with compliance documents available.

Third is experience in custom filtration. Ranveth has more than 20 years of filter R&D and manufacturing experience and has developed over 1,000 filtration solutions, with more than 20 years of continuous export to Europe, the United States, Japan and South Korea. Multiple automated production lines support monthly output in the millions of pieces, and quality control runs through IQC, IPQC and OQC. The company is based in Zhongshan, Guangdong, China.

Request Samples and a Quote

To request samples and a quote, send the device or vehicle model, the size or drawing, the expected airflow or water flow, the operating conditions, and the quantity you intend to order. If you have a target efficiency grade or a pressure-drop limit, include that as well. We will review the brief and respond with a proposed media pairing, sample plan and quotation. You can reach the team through the contact page; technical questions are welcome at any stage, including before a drawing exists.