Cardboard Primary Paper Frame G4 Panel Air Purifier Filter
It belongs to the primary filter category, mainly used for the primary filtration of air intake.
The filter element is V-shaped folded on high-strength cardboard to expand the contact area with the air, ensuring the delivery of clean air smoothly and evenly.
The outer frame uses paper edge frames (white cardboard/die-cut cardboard or other high-strength cut cardboard), and the filter element is made of pleated fiber filter material combined with metal wire mesh to ensure the product's durability. The filter material can be made from non-woven fabric, fiberglass, and imported synthetic fibers according to customer requirements to maintain a higher cost-effectiveness.
Nominal Size inches | Actual Size mm | Rated Airflow m/s | Initial Pressure Pa | Final Pressure Pa | AVerage arrestance % | Filter Object um | Filtration class |
12*24*2 | 295*595*46 | 1600 | <40 | ≤250 | 95 | ≥5 | G4 |
20*20*2 | 495*495*46 | 2200 | <40 | ≤250 | 95 | ≥5 | G4 |
20*24*2 | 495*595*46 | 2700 | <40 | ≤250 | 95 | ≥5 | G4 |
24*24*2 | 595*595*46 | 3200 | <40 | ≤250 | 95 | ≥5 | G4 |


High-strength cardboard, resistant to deformation
Low resistance, high dust-holding capacity, paper edge frames, easy to recycle
High precision in specifications, aesthetically pleasing, cost-effective, can be die-cut into various sizes.
Frame | Cardboard |
Media | Polyester synthetic fiber |
Structure | Panel /Pleated |
Dimension | According to customers' requirements |
Maximum temperature | 80ºC |
Maximum relative humidity | ≤99% |
Fiber class according to EN779 | G4 ( particles ≥ 5microns ) |
Certification | ISO9001, En779 |
Filter Efficiency | 80-95% (Arrestance) |



Free workshop, with its own primary, medium and efficient production workshop, and its own warehouse, standard size stock storage
APPLIATION:
Pre-filtration for air cleanliness in food and pharmaceutical spraying workshops, air purification for constant temperature and humidity air conditioning fresh air units, and laminar flow purification operating rooms' centralized ventilation systems.

Our Mission:
At AILIN or YIFAN, our mission is to deliver the highest quality products at the most competitive prices, ensuring an unparalleled customer experience with a win-win approach.
Getting to Our Factory:
• By High-Speed Rail: To Zhengzhou (Trading company by Ailin) or Xinxiang (Manufacturing company by Yifan) in Henan province.
• By Airplane: To Zhengzhou Xinzheng International Airport in Henan province.


G-level pre-filters, F-level medium bag/pocket filters, H-level HEPA filters, and U-level ULPA filters, as well as various types of high-temperature air filters, oil filters, and water filters.
Our products are SGS and ISO9001 certified and have been exported to Europe, North America, Southeast Asia, Africa, and other regions. Our commitment to quality and after-sales service has earned us a strong reputation in the machinery industry.
WHY CHOOSE US ?
We really hope that customers can ask more questions, and then help customers solve all aspects of the problem1. We use the highest quality raw materials to ensure the durability and reliability of our product.
2. Our design team continuously searches market demands to provide you with unique and practical designs.
3. We ensure competitive prices while maintain high quality for your satisfication
4. We value your needs and strive to ensure prompt delivery of our products to your hands.
5. We offer customization services to meet your unique requirements and preference.
6. Our team posenses extensive industry experience ready to provide you with professional advice and support.



Q1: Are you a factory or trading company?
A1: We are factory with rich experience in China, and our company has established since 2007.
Q2: Can the product be customized?
A2: Yes, both the product and the packaging can be customized.
Q3: Do you provide samples?
A3: Yes, free sample can be provided but customer needs to pay for the shipping costs.
Q4: How to pay?
Our company accepts various ways of payment, such as T/T , L/C etc.
Q5: How long is the delivery time?
A5: It depends on the order quantity. Usually it takes about 15 to 30 working days after receiving your deposit.
Q6: Do you arrange the shipment?
A6: Yes, our company can arrange the shipment to deliver the goods according to the client's customer's requirements.
Q7: What about the after-sales service?
A7:Our company is responsible for the supplied product ONLINE