Thesvin Gas Filter Box — HEPA H13/H14 Ventilator Filter with VOCs Adsorption

The Thesvin Gas Filter Box is a high-efficiency HEPA filter cartridge for ventilator and respirator circuits. It combines a PTFE membrane with activated carbon to capture PM0.3 particles at ≥99.99% efficiency and adsorb VOCs. It is designed for clinical ventilator and anaesthesia machine circuits, industrial respirators, and high-specification air supply systems. Thesvin manufactures it to your drawing, so the frame, seals, and dimensions match your host device.

Fitment and Interface

Fitment drives the design. Thesvin builds each gas filter box to your drawing or sample, so the outer dimensions, port configuration, and sealing surfaces align with your ventilator, anaesthesia machine, or respirator housing. The housing is injection-moulded from non-toxic medical-grade ABS or PC, and the seal is a medical silicone ring joined by ultrasonic welding. That welded joint creates a continuous barrier against leakage at the interface. Because the tooling is opened to your specification, you can define the frame profile, wall thickness, and locating features that hold the filter in the device.

The result is a drop-in fit that maintains the seal under the pressure and flow of your circuit. If you are replacing an existing part, send the old filter and Thesvin will match its critical dimensions before producing a new mould. For new designs, share a 2D drawing or 3D model and the team will confirm the interface before tooling. This fitment-first approach is the same one Thesvin applies across more than 1,000 filtration solutions developed for customers.

What It Filters

The filter media is a composite: a high-precision PTFE microporous membrane, fine glass fibre, and activated carbon. The PTFE layer provides the particle barrier, capturing PM0.3 and larger at ≥99.99%. The activated carbon layer adsorbs and neutralises VOCs and odours. This dual action means one cartridge handles both particulate and gaseous contaminants in the breathing circuit.

Thesvin offers this filter in HEPA H13/H14 grades and in ULPA U15 and above for higher efficiency requirements. A washable version is also available. Typical applications include clinical ventilator and anaesthesia machine circuits, industrial gas masks and positive-pressure respirators, and high-specification fresh-air and oxygen-generation equipment. The filter is manufactured under medical device GMP and tested for filtration efficiency in Thesvin’s CNAS-accredited laboratory.

Dimensions and Technical Data

Three Steps to the Right Part

1. Share the interface details. Send a drawing, a 3D model, or the old filter. Include the device or vehicle model, the port dimensions, and the available space. If you have a sample, mail it and Thesvin will measure the critical features.
2. Confirm the performance specification. Tell us the airflow, the required efficiency grade (HEPA H13/H14 or ULPA U15+), and whether you need VOC adsorption or a washable media. The team will propose a media stack and housing material that fit your circuit.
3. Approve the sample and place the order. Thesvin produces a prototype to your drawing for fit and seal checks. Once approved, production runs in the cleanroom with IQC, IPQC, and OQC checks at each stage.

Delivery and Quality Assurance

Thesvin operates a 50,000 m² facility in Zhongshan, Guangdong, China, including six cleanrooms totalling 20,000 m². The quality system is built on IATF 16949 (achieved in 2024) and ISO 9001, ISO 14001, and ISO 45001 certification. For this gas filter box, dimensional consistency is controlled through IQC, IPQC, and OQC: incoming materials are inspected, in-process dimensions and seal integrity are checked, and finished cartridges are verified before packing. The company’s CNAS-accredited laboratory validates filtration efficiency and resistance, so performance data can support your regulatory submissions.

With more than 20 years of filtration manufacturing and export experience to Europe, the US, Japan, and Korea, Thesvin can provide REACH and RoHS compliance documents. Standard samples ship in 3–5 working days; custom samples involving tooling typically take 15–30 days. Batch lead time is 25–35 days after order confirmation. The standard MOQ is 1,000 pcs; custom configurations are evaluated individually.

Send Thesvin Your Drawing or Old Part

To get a quote, send the device or vehicle model, a drawing or the old part, the airflow or water flow, your operating conditions, and the required quantity. Thesvin will confirm fitment and propose the right configuration. Contact us to start your inquiry.