How Bag Filters Work in HVAC Systems
Pocket filters use multiple fabric pockets made of synthetic fiber or fiberglass media. As air flows through the filter, dust particles are captured within the media layers.
The pocket design allows:
•larger filtration area
•lower face velocity
•higher dust loading capacity
This helps maintain stable airflow while reducing maintenance frequency.
Typical HVAC filtration configuration:
Stage 1
Pre Filter (G3 / G4)
Stage 2
Medium Filter (F7 / F8 pocket filter)
Stage 3
High Efficiency Filter (H13 HEPA)
This multi-stage filtration structure protects final filters and improves system energy efficiency.
Typical Pocket Filter Sizes and Configurations
HVAC bag filters are available in multiple pocket configurations depending on airflow requirements.
Common sizes include:
592 × 592 × 600 mm
592 × 592 × 500 mm
287 × 592 × 500 mm
01
Typical pocket numbers:
5 pocket filter
6 pocket filter
8 pocket filter
10 pocket filter
02
Filter frames are commonly manufactured from:
galvanized steel
aluminum
plastic frames
03
Media options include synthetic fiber media and fiberglass media depending on efficiency requirements.
Bag Filter Efficiency Ratings
Pocket filters are typically classified according to European filtration standards.
Common efficiency levels include:
•F6 - coarse and medium dust removal
•F7 - fine particle filtration for commercial buildings
•F8 - improved fine particle removal for hospitals and laboratories
•F9 - high efficiency HVAC filtration before HEPA stage
Selecting the right efficiency depends on indoor air quality requirements and system airflow conditions.
Packaging and Transportation
| Filter Type | Installation Depth | Airflow Capacity | Pressure Drop |
|---|---|---|---|
| Bag Filter (Pocket Filter) | Requires deeper filter housing | High airflow | Moderate |
| V-Bank Compact Filter | Compact structure | Very high airflow | Lower resistance |
Conclusion
Bag filters remain a cost-effective solution for many AHU systems where cabinet depth is not a major limitation. However, V-bank compact filters are often preferred in modern HVAC designs where space efficiency and lower pressure drop are critical.
Energy Efficiency and Pressure Drop
One of the most important factors in HVAC filtration is pressure drop.
Higher resistance increases fan energy consumption and operating costs.
Pocket filters are designed to maintain stable pressure drop through:
•optimized pocket spacing
•high dust holding capacity
•consistent airflow distribution
Lower resistance means:
•reduced HVAC energy consumption
•longer filter service intervals
•improved ventilation system performance
Our engineers often see significant energy savings when properly sized bag filters replace overloaded panel filters.
ZOSLONG Bag Filter Manufacturing
ZOSLONG is a source factory established in 1997, specializing in HVAC air filtration products.
Our production facility covers over 6500㎡ and supports OEM and customized filter manufacturing.
Key manufacturing features include:
•high strength pocket welding or stitching
•uniform pocket spacing for stable airflow
•durable galvanized steel or aluminum frames
•synthetic or fiberglass filter media options
Our engineering team works with HVAC contractors and distributors to provide suitable filtration solutions for various airflow conditions.
Our Bag Filter Product Range
We supply several types of pocket filters for HVAC systems.
Pleated Bag Filters
Designed for high airflow AHU systems.
Standard Pocket Filters
Used in commercial ventilation systems.
Industrial Dust Collector Bags
Used in industrial dust filtration systems.
Bag Filter Housings and Vessels
Metal housings designed for installing multi-pocket filters.
These products support multiple filtration efficiencies and airflow capacities.
Factory Direct Supply for HVAC Projects
Working directly with a manufacturer helps reduce procurement cost while ensuring consistent product quality.
ZOSLONG provides:
•OEM bag filter manufacturing
•customized sizes and filtration efficiency
•stable production capacity
•export support for international HVAC projects
If you are sourcing HVAC bag filters or pocket filters, our engineering team can provide product recommendations and technical support.
Contact us to request a catalog or quotation.
After-Sales Service and FAQ
Q: Can the product be customized?
A: Yes, our products and packaging can be customized to meet specific customer requirements.
Q: What are the payment terms?
A: We accept various payment methods, including telegraphic transfer (T/T) and letters of credit (L/C).
Q: How long is the delivery time?
A: Delivery time varies based on order quantity and production schedule. Standard products typically take 4 weeks, while customized products may take longer. Specific delivery times are negotiated with the customer.
Q: What is the service life of the filter?
A: The service life of our F7 Bag Filter is typically 3 to 6 months, depending on operating conditions and maintenance. We recommend checking the filter every 3 to 4 months and replacing it if necessary.
Q: Can the filter be cleaned?
A: Some F7 Bag Filters are washable and reusable, but this depends on the material and application. We advise consulting our technical support team before attempting any cleaning.
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