Pocket Air Filter for HVAC and Industrial Ventilation Systems
Product Overview
The pocket air filter is designed for medium-efficiency air filtration in HVAC systems, air handling units and industrial ventilation systems. It uses multiple deep filter bags made from synthetic fiber media, giving the filter a much larger effective filtration area than a flat panel filter. This structure allows it to capture more dust while maintaining stable airflow and relatively low resistance.
In actual HVAC systems, pocket filters are usually installed after a coarse pre-filter and before cooling coils, fine filters or HEPA filters. Their main job is to remove dust, pollen, fibers and other airborne particles before the air enters the next treatment stage. This helps keep cooling coils and air ducts cleaner and also reduces the dust load on more expensive downstream filters.
The filter can be supplied in different efficiency grades according to the system requirement. Common options include M5, M6, F7, F8 and F9, or equivalent grades based on ISO 16890. Frame material, filter size, pocket depth and number of pockets can also be customized to match different AHU and ventilation equipment.
Typical Applications
Pocket air filters are widely used in commercial buildings, factories, hospitals, laboratories, cleanrooms, food and beverage workshops and pharmaceutical production areas. In office buildings, hotels and shopping malls, they are commonly used in central air-conditioning systems to improve supply air quality. In industrial plants, they help reduce dust entering production areas and protect ventilation equipment. In cleanroom systems, they are often used as an intermediate filtration stage before HEPA filters.
Typical Filtration Arrangement:
Pre-Filter → Pocket Filter → Cooling Coil → HEPA Filter or Supply Air
This setup is practical because the pre-filter removes larger dust first, the pocket filter captures medium and fine particles, and the final HEPA filter only handles the smallest particles that remain.
Manufacturer Profile
Shanghai Pullner Filtration Technology Co., Ltd.
Established: 2013
Shanghai Pullner Filtration Technology Co., Ltd., established in 2013, is a professional manufacturer of filter cartridges and filtration solutions.
With a 15,000m² production facility, 20+ production lines, advanced testing laboratories, and experienced R&D teams, Pullner provides high-performance filtration products for Microelectronics, Biopharmaceuticals, Food & Beverage, Petrochemical, Water Treatment, Power Generation, and other industries.
Certified with ISO 9001, ISO 14001, and ISO 45001, Pullner is committed to delivering reliable and innovative filtration solutions to customers worldwide.
Frequently Asked Questions
Q1: What is a pocket air filter mainly used for?
A pocket air filter is mainly used in HVAC and air handling systems to remove dust and airborne particles. It is commonly installed after a coarse pre-filter and before cooling coils, fine filters or HEPA filters.
Q2: What is the difference between a pocket filter and a panel filter?
A pocket filter has several deep filter bags, so it provides a much larger filtration area than a flat panel filter. This usually gives it higher dust-holding capacity and a longer service life, making it more suitable for medium and fine air filtration.
Q3: Can this filter be used before a HEPA filter?
Yes. This is one of the most common applications. A pocket filter can remove a large part of the dust before the air reaches the HEPA filter, which helps reduce HEPA filter loading and extend its replacement interval.
Q4: Which efficiency grade should I choose?
The correct grade depends on the air quality requirement and the position of the filter in the HVAC system. F7 and F8 are commonly used for general medium-to-fine filtration, while F9 can be selected when higher particle removal efficiency is required. The final selection should also consider airflow and pressure drop.
Q5: Can the size and number of pockets be customized?
Yes. Width, height, pocket depth, number of pockets, frame material and efficiency grade can all be customized according to the existing AHU or filter frame.
Q6: How do I know when the filter should be replaced?
The filter should be checked according to differential pressure, airflow and operating condition. When the pressure drop increases significantly or the airflow becomes lower than normal, the filter may be heavily loaded with dust and should be replaced.
Q7: Can this filter be used in food and pharmaceutical factories?
Yes. Pocket filters are commonly used in the ventilation and air-conditioning systems of food, beverage and pharmaceutical facilities. They are used for air filtration, not for direct filtration of food or liquid products.
Q8: What information is needed for quotation?
Please provide the filter width, height, pocket depth, number of pockets, required efficiency grade, frame material and quantity. If the existing specification is not clear, photos and actual dimensions of the current filter can also be provided.
Q9: What frame materials are available?
Common options include galvanized steel, aluminum and plastic. The suitable material depends on installation environment, corrosion conditions and project requirements.
Q10: Is the pocket filter washable?
Most synthetic fiber pocket filters are designed as replaceable filters rather than repeatedly washable filters. Whether cleaning is possible depends on the actual filter media and construction. For stable filtration performance, replacement is generally recommended once the final pressure drop is reached.
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