
What is a Primary Air Filter? Types, Efficiency Grades & B2B Sourcing Guide
In commercial HVAC, cleanroom design, and heavy industrial filtration, the primary efficiency air filter (commonly referred to as a primary air filter or
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Tailor your airflow performance with our Custom Size Medium Separator Filter, providing non-standard sizes produced upon request. This high air flow unit supports up to 4000m³/h, making it the elite choice for industrial air conditioning systems and spray booths.
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Automotive Paint Finishing Systems: A critical component applied in paint finishing systems to intercept particulates that cause surface defects, ensuring a flawless high-gloss finish.
Large-Scale AHU Customization: Specifically designed for air conditioning systems in massive infrastructures like airports and skyscrapers, where non-standard sizes are required to fit unique housing depths.
Food & Beverage Production: Provides reliable medium filtration in processing and packaging zones to ensure air purity and prevent cross-contamination.
Hospital HVAC Systems: Ideal for high-capacity medical ventilation requiring a balance of high air flow and stable filtration efficiency.
Commercial Spray Booths: The elite choice for industrial spray booths, supporting a high air flow of up to 4000m³/h to maintain consistent air velocity and overspray control.

| Feature | Chuqi High-Flow OEM Pro | Standard Medium Filters | The Chuqi Advantage |
| Airflow Capacity | Supports up to 4000m³/h. | Typically limited to 2500m³/h. | High Productivity: Handles large-scale ventilation needs with ease. |
| Size Flexibility | Bespoke dimensions (150/220/292mm depth). | Restricted to standard stock sizes. | Perfect Integration: Fits any unique AHU housing without modification. |
| Initial Resistance | Optimized low profile of ≤150-250Pa. | Often exceeds 300Pa at high flow. | Energy Efficiency: Reduces fan load and lowers operational costs. |
| Structural Support | 0.03mm aluminum foil prevents vibration. | Prone to media fluttering at high speed. | Stable Efficiency: Ensures consistent filtration in high-velocity streams. |
| Seal Quality | Fully secured with universal glue. | Standard mechanical or foam seals. | Zero Leakage: Eliminates air bypass for superior purity. |
| External dimensions Outside dimensions (mm) | Rated air volume Rated airflow (m³ / h) | initial resistance Imitial resistance (Pa) | Efficiency (colorimetric method) Efficiency (%) | Dust holding capacity Dust capacity (g) |
| 305X305X150/220/292 | 700~1500 | ≤ 150-250 | F6 ~ F9 | 400 |
| 320X320X150/220/292 | 700~1500 | ≤ 150-250 | F6 ~ F9 | 450 |
| 484X484X150/220/292 | 1000~2200 | ≤150-250 | F6~F9 | 680 |
| 592X287X150/220/292 | 1400~3000 | ≤150-250 | F6~F9 | 420 |
| 592X592X150/220/292 | 1000~2000 | ≤150-250 | F6~F9 | 840 |
| 610X305X150/220/292 | 1500~3000 | ≤150-250 | F6~F9 | 560 |
| 610X610X150/220/292 | 2000~4000 | ≤150-250 | F6~F9 | 1120 |
We provide superior air purity through our F6 to F9 medium separator filter range, including the High capacity F9 air filter with gel-glue sealant that delivers up to 98% efficiency. Utilizing advanced polyurethane sealant and EVA gasket seals, we guarantee 100% leak-proof integrity for sensitive environments. From a Low resistance F8 separator type filter for electronics labs to an 80C heat resistant medium separator filter for industrial ovens, Chuqi offers bespoke solutions for the most demanding technical sectors.

Q1: Can this filter be customized for non-standard equipment?
Absolutely. We specialize in providing non-standard sizes produced upon request. Whether your equipment requires a specific width or a unique depth like 150mm, 220mm, or 292mm, we can tailor the filter to fit your specific AHU housing.
Q2: How does the filter maintain stability under high-velocity airflow?
The filter utilizes 0.03mm thickness aluminum foil separators. This precision support prevents the media from vibrating or collapsing in high-velocity streams, which is essential for maintaining a high rated air flow of up to 4000m³/h.
Q3: Is this filter suitable for high-humidity environments?
Yes. For environments with high humidity, such as food processing or certain industrial zones, we offer stainless steel or galvanized steel frame options to provide maximum corrosion resistance.
Q4: What is the maximum temperature this filter can withstand?
The Custom Size Medium Separator Filter is designed to safely operate at a maximum operating temp of 80°C, making it suitable for a wide range of industrial air conditioning and drying applications.
Q5: How does the initial resistance compare to other high-flow filters?
Despite its high capacity, this filter maintains a very low initial resistance of ≤150-250Pa even at its maximum rated flow. This helps your system run more efficiently and reduces the strain on your fan motors.

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