Primary Air Filter

Primary Air Filter is used to filter dust particles in air conditioning systems, and also the step filtration of high-efficiency filtration devices and of large air compressors, etc. It is mainly used to filter particles whose diameter are more than 5μm. The characteristics of the primary air filters are low resistance and high dust-holding capacity. There are three types of primary air filters such as panel type, folding type, and bag type. The outer frame can be made of anti-moisture-coated kraft card paper, aluminum, plastic, or galvanized iron (in line with UL) according to customers’ needs. The filter media can be chosen from non-woven fabrics , nylon mesh, activated carbon, metal hole mesh, etc.

Primary air filters are widely used in ventilation systems of large civil buildings such as office buildings, conference rooms, hospitals, shopping malls, and airports, as well as pre-filtration of central air-conditioning and centralized ventilation systems in ordinary industrial plants, clean rooms and recycling clean air systems.
Filtering levels of G2, G3 and G4 are mostly chosen by our customers.

Nantong Henka Environment Solutions Co.,Ltd.

Nantong Henka Environment Solutions Co., Ltd was founded in 2004. Henka is one of the famous and professional air filter manufacturers for air purifiers, air cleaners, and ventilation systems. Our air filters include HEPA, VOC removal filters, Formaldehyde removal filters, Activated Carbon filters, Odor removal filters, HVAC filters, i-Hepa ventilation purification devices, and IFD purification devices.
Henka is the customized air filter supplier for the famous brands of air purifiers and air cleaners in the North American market and China market. Henka provides not only air filters but also professional air purification solutions.
Henka is located in Haimen City, Jiangsu Province, which is only 120 kilometers away from Shanghai. Henka has ISO14001:2015, ISO9001:2015 and ISO45001:2018 certifications, efficiency and air resistance test system for filter media, noise test lab, 30 cubic meters test room for formaldehyde and VOC remove efficiency, CADR test room for air purifier. ASHRAE 52.2 is used in testing air filters.
With more than 20 years of experience working with a US engineering team, we can design the product based on the specifications, drawings, samples, or even ideas from our customers, and provide professional air filtration solutions to our customers.

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Primary Air Filter Industry knowledge

How to clean or replace the primary air filter?

The steps to clean or replace the primary air filter are as follows:

1. Shut down the system: Before performing any maintenance work, be sure to shut down the relevant air handling system and disconnect the power supply.

2. Access the filter: Open the housing or chamber where the filter is located so the filter can be easily accessed.

3. Check the filter: Check the filter for any signs of damage, deformation, or excessive clogging. If these problems are found, the filter should be replaced.

4. Clean the reusable filter: Use a vacuum cleaner to remove dust and debris from the surface of the filter. If necessary, the filter can be cleaned using a mild detergent and water. Make sure to rinse thoroughly to remove all detergent residue. Allow the filter to air dry or blow dry with compressed air (be careful not to damage the surface structure of the filter).

5. Replace disposable filter: If the filter is not reusable or its performance decreases after cleaning, it should be replaced with a new filter.

6. Install new or cleaned filter:
a. Make sure the filter is positioned correctly, the label usually indicates the direction of airflow (e.g., side to back).
b. Hold the filter firmly in place and ensure a good seal to prevent unfiltered air from bypassing the filter.

7. Restart the system: After cleaning or replacing the filter, restart the air handling system and check for leaks or other problems.

8. Record maintenance: Record the dates when filters are cleaned or replaced to help plan future maintenance.

After cleaning or replacing the primary air filter, restart the air handling system. What should you do if leaks or other problems occur?

If you find leaks or other problems when restarting the air handling system after cleaning or replacing the primary air filter, please follow the steps below to troubleshoot and resolve:

1. Shut down the system: First, shut down the air handling system and disconnect power to ensure safe operation.

2. Check filter installation: Check whether the newly installed or cleaned filter is placed correctly and ensure the air flow direction is correct.

3. Check the seal: Carefully check the seal between the filter and the filter tank. If you find a poor seal, you may need to replace the gasket or use sealant or tape to improve the seal.

4. Check the filter: Make sure the filter is not damaged, deformed or improperly installed. If there is a problem with the filter, it may need to be recleaned or replaced.

5. Check the filter groove: Check the filter groove for damage or deformation, which may affect the sealing performance of the filter. If problems are found, the filter tank may need to be repaired or replaced.

6. Check connecting parts: Check other connecting parts in the air handling system, such as pipes, flanges and joints, to make sure they are not damaged or leaking.

7. Check the rest of the system: The leak may not be caused by the filter, but a problem elsewhere in the system. Check components such as fans, motors, and air ducts to make sure they are working properly.

8. Restart the system: After fixing leaks or other problems, restart the air handling system and check again for leaks or other problems.

9. Document maintenance: Record the dates when filters were cleaned or replaced and steps taken to fix leaks to help plan future maintenance.

10. Seek professional help: If the problem cannot be solved by yourself, or you are not familiar with the operation and maintenance of the system, it is recommended to contact a professional air conditioning or air handling system maintenance service.