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Celrith washable activated carbon sponge filter is an odor removal filter made from polyurethane sponge with activated carbon, designed to capture large particles and adsorb harmful gases such as formaldehyde, benzene, and ammonia. It is used as a pre-filter in air purifiers, fresh air systems, automotive air conditioning, central air handling units, and industrial vacuums. The filter is suitable for appliance manufacturers and HVAC suppliers who need a reusable, custom-fit filtration layer that reduces odor and gas load on downstream components.
Indoor air carries more than visible dust. Cooking, furnishings, and outdoor pollution release fine particles, odors, and volatile organic compounds (VOCs) that circulate through equipment and living spaces. In air fryers and similar appliances, oil mist and grease particles can quickly coat fans and heat exchangers, while formaldehyde and benzene from building materials and consumer products add a persistent chemical load. Without an effective first stage, these contaminants reach sensitive components, reducing heat transfer efficiency and increasing maintenance frequency.
Celrith addresses this by combining initial particle capture with gas-phase adsorption in a single sponge structure. The open-cell polyurethane matrix traps hair, dust, and larger debris, while the activated carbon adsorbs odorous and harmful gases. This dual action protects downstream filters and extends the service life of the entire system.
When particles and gases are not intercepted early, they impose a compounding load. Dust accumulates on coils and fans, forcing blowers to work harder and raising energy consumption. Grease films in kitchen appliances can become breeding grounds for bacteria and reduce airflow. Chemical gases can degrade certain plastics and electronics over time, and odors recirculate if not properly adsorbed. In automotive cabins, traffic exhaust and industrial emissions enter through the ventilation system, affecting passenger comfort. Central air handling units draw in outdoor pollutants that foul coils and ducts, leading to higher cleaning costs.
The Celrith filter is engineered to sit at the front line of these systems. Its low air resistance ensures minimal impact on airflow, while the flexible sponge conforms to irregular spaces, making it easy to integrate into existing designs without major modifications.
The filter is built on a polyurethane sponge base, into which high-quality powdered or fine granular activated carbon is fixed through a special curing process. This construction delivers strong adsorption of formaldehyde (HCHO), benzene, ammonia, and other harmful gases, alongside initial filtration of large particles such as hair and dust. The open-cell structure provides excellent air permeability and low resistance, which helps maintain system efficiency.
A key advantage is the washable design. Unlike disposable filters, the Celrith sponge can be rinsed and reused, significantly reducing consumable costs for end users and service providers. The material is highly flexible and can be cut or die-cut into any shape, accommodating custom dimensions and irregular spaces. This makes it suitable for OEM projects where fit and form are critical.
| Item | Detail |
|---|---|
| Product name | Washable Activated Carbon Sponge Filter |
| Core base material | Polyurethane sponge |
| Adsorption material | Premium powdered or fine granular activated carbon, fixed via special curing process |
| Primary performance | Initial filtration of large particles (hair, dust) + strong adsorption of formaldehyde (HCHO), benzene, ammonia, and other harmful gases |
| Physical advantages | Washable and reusable, very low air resistance, highly flexible and easy to cut, good air permeability |
| Typical applications | Air purifier pre-filter layer, fresh air system pre-filter, automotive air conditioning filter, central air handling unit return air inlet, industrial vacuum cleaner |
| Customization | Full OEM/ODM support: various thicknesses (e.g., 3 mm–50 mm), pore densities (PPI), and die-cut shapes |
| Quality system | Produced in 20,000 m² of cleanrooms; company certified to ISO 9001, ISO 14001, and IATF 16949 |
Celrith filters serve appliance manufacturers, HVAC system integrators, automotive aftermarket suppliers, and industrial equipment makers. In air purifiers, the sponge acts as a pre-filter that captures coarse particles and gases, protecting the HEPA stage. Fresh air systems use it to reduce outdoor odors and pollutants before they enter the living space. Automotive cabin filters benefit from its compact size and odor control. Central air handling units deploy it at return air grilles to lessen coil fouling. Industrial vacuum cleaners use the filter to trap fine dust and odors, improving workplace air quality.
The washable nature makes it particularly attractive for applications where maintenance access is limited or where consumable costs are a concern. End users can simply rinse the filter with water, dry it, and reinstall, extending replacement intervals and reducing waste.
Celrith products comply with REACH and RoHS environmental regulations, and compliance documents are available upon request. The company holds ISO 9001, ISO 14001, and ISO 45001 certifications, and in 2024 obtained IATF 16949 for automotive quality management. Our in-house CNAS-accredited laboratory can issue test reports for filtration efficiency, dust holding capacity, and resistance, providing reliable data for your qualification process.
Manufacturing takes place in Zhongshan, Guangdong, China, in a 50,000 m² facility that includes 20,000 m² of cleanrooms across six rooms. With over 20 years of experience in filtration R&D and manufacturing, we have developed more than 1,000 filtration solutions and support full OEM/ODM customization, including size, structure, filter grade, frame material, logo, and packaging. Multiple automated production lines enable monthly capacity of millions of pieces, and IQC, IPQC, and OQC processes ensure batch-to-batch consistency.
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The Celrith washable activated carbon sponge filter removes large particles such as hair and dust through initial filtration, and adsorbs harmful gases including formaldehyde (HCHO), benzene, and ammonia. It is effective as a pre-filter in air purifiers, HVAC systems, and automotive cabins. For specific efficiency data, please request a test report from our CNAS-accredited laboratory.
Under normal household use (3–5 times per week), we recommend replacing the filter every 1–3 months. Actual life depends on cooking frequency, oil content, and airflow design. We can perform life-matching tests based on your appliance design and label a suggested replacement cycle to help end users and improve consumable repurchase rates.
Yes, the polyurethane sponge construction allows repeated washing with water. After rinsing, allow it to dry completely before reinstalling. The washable design significantly reduces consumable costs and waste compared to disposable filters, while maintaining low air resistance and adsorption capacity.
Absolutely. We offer full OEM/ODM customization, including thickness from 3 mm to 50 mm, various pore densities (PPI), and die-cut shapes to fit your device. You can also specify packaging, logo, and other branding elements. Our team can provide design assistance and samples for validation.
Standard specifications typically have an MOQ of 5,000–10,000 pieces; custom specifications generally start at 10,000 pieces, depending on material and tooling. Sample lead time is about 5–7 working days, and bulk delivery is usually 25–35 days after order confirmation and sample approval. Multiple automated lines allow flexible scheduling during peak seasons.
For B2B customers with a clear purchase intention, we can provide free samples from stock (customer bears shipping costs). Custom samples may incur a sample fee, which is deductible from the bulk order payment. Samples help you verify fit and performance before committing to production.
The product complies with REACH and RoHS environmental regulations, and the company holds ISO 9001, ISO 14001, and ISO 45001 certifications. In 2024, we obtained IATF 16949 for automotive quality management. Our CNAS-accredited laboratory can provide test reports for filtration efficiency, dust holding capacity, and resistance.
Store in a cool, dry place away from direct sunlight, heat sources, and strong oxidizers. Keep the original packaging sealed until use. Under these conditions, the shelf life is 2 years from the date of manufacture. Proper storage ensures the filter remains clean and effective.