Bag type medium efficiency filter is a device used for conveying media pipelines, mainly used for intermediate filtration in central air conditioning and centralized air supply systems, which can protect lower level filters and system equipment. Its filtration particle size is 1-5 μ m, with a filtration efficiency of 60-95% (colorimetric method), suitable for ambient temperatures ≤ 80 ℃.
The filter adopts a bag structure design, with frame materials including cold plate spray coating, galvanized sheet, and aluminum alloy. The filter material is made of non-woven fabric and fiberglass. It has the characteristics of high dust holding capacity and low resistance. When installing, it is necessary to ensure that the length direction of the filter bag is perpendicular to the ground. It needs to be replaced every 3-4 months or when the resistance reaches 400Pa. Widely used in pharmaceuticals, electronics, food, and central air conditioning ventilation systems, it can be directly delivered to users in places where air purification cleanliness requirements are not strict. It is often used as the front-end filter of high-efficiency air filters to extend their lifespan.
Details:
Filter object: Medium particles of 1-5 μ m (pollen, smoke, bacteria, fine dust)
Efficiency level: F5-F9 (EN 779); Counting efficiency 45% -97%
F5-F6: Medium Efficiency
F7-F9: High school performance (commonly used)
Structural form: Standard bag type (mainly 6-8 bags)
Unique bag design increases the filtration area and prevents the filter bags from squeezing each other
Frame material: aluminum alloy, galvanized steel plate, stainless steel
Filter material: high-quality non-woven fabric, melt blown glass fiber (with strong thermal stability)
Core Features
Moderate resistance, high dust holding capacity, long service life (6-12 months)
Uniform wind speed, no odor, good air tightness
High cost-effectiveness and strong universality
Application
Intermediate filtration in hospitals, schools, laboratories, and electronic factories;
Clean air conditioning systems for pharmaceutical and food industries;
Pre protection of HEPA/ULPA filters;
Commercial central air conditioning, precision air conditioning, ventilation and purification units.
Air Filter Product Parameters
| Parameter | Primary Filter | Medium Efficiency Bag Filter | HEPA Filter | ULPA Filter |
| Filtration Accuracy | ≥5μm large particles | 1–5μm medium particles | ≥0.3μm fine particles | ≥0.12μm nano-scale particles |
| Efficiency Grade | G1–G4 | F5–F9 | H13–H14 | U15–U17 |
| Typical Efficiency | 20%–90% (gravimetric method) | 45%–97% (counting method) | 99.97%–99.995% | ≥99.9995% |
| Filter Media | Non-woven fabric, metal mesh | Non-woven fabric, fiberglass | Ultra-fine glass fiber | Borosilicate glass fiber |
| Initial Resistance | ≤50Pa | ≤150Pa | 200–250Pa | 250–350Pa |
| Service Life | 1–3 months | 6–12 months | 1–3 years | 2–5 years |
| Main Function | Pre-filtration, rear-end protection | Intermediate filtration, dust removal | Terminal fine filtration, bacteria removal | Ultra-clean filtration, nano-particle removal |
