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Celrith fresh air and fresh air conditioning odor removal filters are composite filter elements that combine a polypropylene (PP) media layer with modified activated carbon to capture fine particulate matter and adsorb odorous gases in one unit. They are designed for fresh air systems, fresh air air conditioners, and central HVAC systems, targeting PM2.5, pollen, formaldehyde, TVOC, and other odor-causing substances. The product suits residential and commercial installations where both particle filtration and odor control are required, and it is manufactured by Celrith in Zhongshan, Guangdong, China.
Outdoor air brought into a building carries more than dust. Fine particles such as PM2.5 and pollen penetrate living spaces, while gaseous contaminants—formaldehyde from furnishings, TVOC from paints and adhesives, and odors from traffic or industrial sources—can accumulate indoors. In fresh air systems, the filter is the first barrier against these impurities. A filter that only traps particles leaves gases and odors to circulate; a filter that only adsorbs gases allows fine dust to load the system. The dual challenge is to address both at the same time without creating excessive resistance to airflow.
Celrith addresses this by combining two functional layers in a single filter: a composite PP media for particle capture and a high-iodine-value activated carbon layer for gas-phase adsorption. This construction allows one filter to deliver both particulate removal and odor removal, simplifying maintenance and reducing the number of components in the air path.
When particles are not effectively removed, they deposit on heat exchanger coils, fans, and ductwork, reducing heat transfer efficiency and increasing energy consumption. Over time, dust buildup can promote microbial growth and create unpleasant odors. Gaseous contaminants, on the other hand, are not captured by standard particle filters and can be recirculated throughout the building, affecting indoor air quality and occupant comfort.
By integrating particle and gas filtration, Celrith filters help reduce the load on downstream components. The PP media captures fine particles before they reach critical equipment, while the activated carbon adsorbs odorous gases and volatile organic compounds. This dual action helps maintain system performance, extend the life of HVAC components, and improve the perceived air quality in the served spaces.
Celrith filters are built around a composite PP media that provides particle filtration efficiency from F7/F8/F9 (medium efficiency) up to H11/H12/H13 (HEPA) grades. This range allows selection based on the required cleanliness level and the acceptable pressure drop. The activated carbon layer uses modified activated carbon with a high iodine value, which indicates a large surface area for adsorbing gases such as formaldehyde, TVOC, ammonia, and hydrogen sulfide.
The filter construction can be customized to match specific equipment requirements. Celrith offers flat panel, V-bank folded, and composite configurations, with dimensions and frame options tailored to the host unit. This flexibility ensures a proper fit and optimal airflow characteristics. Each filter is tested for airflow resistance and filtration efficiency before shipment, and production follows ISO 9001 and IATF 16949 quality management systems.
| Item | Detail |
|---|---|
| Product name | Fresh Air / Fresh Air Conditioning Composite Filter |
| Core media | Composite PP (polypropylene) filter paper + modified odor-removal activated carbon |
| Particle filtration efficiency | Covers F7 / F8 / F9 (medium efficiency) to H11 / H12 / H13 (HEPA) grades |
| Core performance | Dual function: removal of fine particulate matter (PM2.5, pollen) + deep adsorption of formaldehyde, TVOC, and other odors |
| Application categories | Fresh air system odor removal filter, fresh air air conditioner high-efficiency filter, fresh air machine HEPA composite filter |
| Main application scenarios | Residential wall-mounted fresh air machines, cabinet-type fresh air air conditioners, residential and commercial central fresh air systems (HVAC) |
| Customization | Tooling and production fully according to customer unit requirements (flat panel, V-bank folded, and composite types available) |
| Quality and certification | Strict airflow resistance and purification efficiency tests before factory release. Production complies with ISO 9001 quality management system and IATF 16949 international certification. Materials are environmentally safe. |
Celrith fresh air filters are used in residential wall-mounted fresh air machines, cabinet-type fresh air air conditioners, and central fresh air systems in homes and commercial buildings. They are also suitable for commercial air handling units that require both particle and odor control, such as in offices, schools, and retail spaces. The customizable design makes them a fit for OEM and ODM projects where specific dimensions and performance characteristics are needed.
Celrith products are manufactured in a 50,000 m² production facility in Zhongshan, Guangdong, China, which includes 20,000 m² of cleanrooms across six independent workshops. The company holds ISO 9001, ISO 14001, and ISO 45001 certifications, and has been IATF 16949 certified since 2024. Products comply with REACH and RoHS environmental regulations, and compliance documents are available upon request.
The in-house laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust holding capacity, and airflow resistance. With over 20 years of experience in filter development and manufacturing, Celrith has supplied customers in Europe, the United States, Japan, and South Korea. The company supports OEM/ODM projects with customization of size, structure, filter media grade, frame material, logo, and packaging, and has developed more than 1,000 filter solutions. Multiple automated production lines provide a monthly capacity of several million pieces.
To receive a quotation or discuss a custom filter for your application, please contact us with the following details: your device or vehicle model, required size or a drawing, airflow or water flow rate, operating conditions, and estimated quantity. This information helps us recommend the most suitable configuration and provide an accurate quote.
Contact Celrith to start the conversation. We are ready to assist with technical questions and sample requests.
The filter removes fine particulate matter such as PM2.5 and pollen through its composite PP media, and adsorbs odorous gases including formaldehyde, TVOC, ammonia, and hydrogen sulfide using a high-iodine-value activated carbon layer. It is designed for fresh air systems and air conditioners to address both particle and gas-phase contaminants.
Celrith fresh air filters are available in particle filtration efficiency grades from F7/F8/F9 (medium efficiency) to H11/H12/H13 (HEPA). The appropriate grade depends on the required air cleanliness and the acceptable pressure drop for your system.
Yes, Celrith offers full customisation based on your equipment requirements. This includes dimensions, shape (flat panel, V-bank folded, or composite), filter media grade, activated carbon type and loading, frame material, and packaging. Provide your specifications or a drawing for a tailored solution.
Under normal usage conditions (PM2.5 annual average around 35 μg/m³, 8–12 hours daily operation), a replacement interval of 6–12 months is recommended. Actual life depends on local air quality, usage frequency, and contaminant concentration; we can optimise the filter design for your specific environment.
Standard models typically have an MOQ of 500–1,000 pieces, while customised models generally require 1,000–2,000 pieces. Stock items ship within 7–10 days; custom orders take about 25–35 days for the first order (including tooling) and 15–25 days for repeat orders.
Yes, samples are available. Standard规格 samples can be provided free of charge; customers only cover international shipping costs. Custom samples may incur a fee depending on tooling complexity, which is refundable upon bulk order. We can also provide CNAS laboratory test reports to support your evaluation.
The activated carbon used is food-grade/environmentally friendly and complies with RoHS and REACH hazardous substance requirements. It does not contain heavy metals, formaldehyde, or other VOC emission sources. For sensitive applications, low-emission and low-dust activated carbon options are available.
Please contact us with your device or vehicle model, required size or drawing, airflow rate, operating conditions, and estimated quantity. This allows us to recommend the right filter and provide an accurate quotation. <a href="/en/contact">Contact Celrith</a> to discuss your requirements.