ULPA Dust Filter Box for Ventilators and Respirators – Custom Fit

This ULPA dust filter box is a high-efficiency filter assembly that removes PM0.3 particles at ≥99.99% efficiency and adsorbs VOCs, designed for ventilator and anesthesia circuits, powered air-purifying respirators, and high-spec fresh-air or oxygen equipment. It is made by Thesvin, a filter manufacturer based in Zhongshan, Guangdong, China, and is built to your drawing for a precise fit. The box combines a PTFE membrane or glass-fiber media with activated carbon, and its housing and seal are configured to match the host device interface.

Fitment and Interface

Fitment is the starting point for this filter box. Thesvin manufactures the housing to your drawing, so the outer dimensions, port layout and locating features match the device or duct it serves. The box is available with a non-toxic medical-grade ABS or PC injection-molded shell, and the seal is a medical silicone gasket joined by ultrasonic welding to prevent leakage at the interface.

Because the housing is tooled to your drawing rather than selected from a fixed catalogue, the critical interfaces — inlet and outlet diameters, insertion depth, and any retention geometry — are reproduced to your specification. This approach suits ventilator and anesthesia circuits where the filter must seat correctly, and industrial respirator masks where the cartridge must lock into the mask body. If you are replacing an existing part, the old part can serve as the reference for the new tooling.

What It Filters

The core media is a high-precision PTFE microporous membrane, with options for glass-fiber media and a composite activated-carbon layer. The PTFE membrane provides precise removal of PM0.3 particles at ≥99.99% efficiency, and the activated-carbon layer adsorbs VOCs and other gaseous contaminants. This dual function means the same box addresses both particulate and gas-phase filtration where required.

The filter is offered in ULPA grades including U15 and above, so you can select the efficiency level that matches your application. Typical uses include clinical ventilator and anesthesia breathing circuits, industrial respirators and positive-pressure respirators, and high-specification fresh-air and oxygen-generation equipment. The media and housing are assembled in a controlled environment, and each production batch is tested for filtration performance.

Dimensions and Technical Data

Three Steps to the Right Part

1. Share your interface details. Send a drawing or the old part, together with the device or vehicle model. We confirm the housing dimensions, port sizes and seal arrangement needed for a correct fit.
2. Define the filtration requirement. Tell us the airflow and the contaminants to be removed — particles, VOCs, or both — so we can specify the media and ULPA grade (U15 or above) for your application.
3. Approve the sample and place the order. We produce a sample for your fit and performance check, then proceed to production once the sample is approved.

Delivery and Quality Assurance

Thesvin operates under IATF 16949, with IQC, IPQC and OQC controls applied to dimensional consistency from incoming material to final inspection. The company holds ISO 9001, ISO 14001 and ISO 45001 certifications, and its own laboratory is CNAS-accredited for filter efficiency, dust-holding capacity and resistance testing. Production takes place in a 50,000 m² facility, which includes six clean workshops totalling 20,000 m².

With more than 20 years of filter development and manufacturing experience, Thesvin has supplied OEM and ODM customers in Europe, the United States, Japan and Korea, and has developed over 1,000 filter solutions. Products comply with REACH and RoHS requirements, and compliance documents can be provided. The plant is located in Zhongshan, Guangdong, China, and multiple automated lines support monthly output in the millions of pieces.

Send Thesvin Your Drawing or Old Part

To receive a quotation, please provide the following: your device or vehicle model; a drawing or the old part for dimensional reference; the required airflow and water flow (if applicable); operating conditions such as temperature and contaminant type; and the estimated quantity. With these details, we can confirm the fitment and filtration specification and respond with pricing and lead time. Contact our team to start the process.