
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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Meet the most demanding industrial ventilation requirements with our High Air Flow Pleated Medium Filter. We specialize in non-standard sizes produced upon request, providing tailored medium filtration for unique AHU housings. Whether in high-humidity chemical industry zones or high-dust metallurgy sites, this durable filter handles up to 4000m³/h with ease.
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Heavy Industry Ventilation: Ideal for air intake systems in metallurgy, oil, and chemical industries, where filters must withstand high mechanical impact and constant vibration.
Large-scale Food Processing: Reliable medium filtration for the food industry, ensuring large production floors remain free from external contaminants while maintaining high air exchange rates.
Automotive Paint Finishing Systems: Crucial for industrial paint finishing systems, intercepting large dust particles to ensure defect-free surfaces in high-capacity spray booths.
Power Plant Air Intake: Protects large turbines and generator rooms by handling a large air flow of up to 4000m³/h, preventing particulate wear on high-value machinery.
High-Humidity Processing Zones: Engineered for industrial sites with up to 80% humidity, such as coastal factories or pulp and paper mills, where standard filters might degrade.

| Feature | Chuqi High-Flow Industrial Pro | Standard Pleated Filters | The Chuqi Advantage |
| Airflow Capacity | Rated for up to 4000m³/h. | Typically limited to 2500m³/h. | High Productivity: Supports massive ventilation requirements with a single unit. |
| Customization | Non-standard sizes produced upon request. | Limited to standard shelf sizes. | Precision Fit: Tailored depths (150/292mm) to fit unique AHU housings perfectly. |
| Structural Rigidity | Aluminum foil separators & reinforced frame. | Flimsy pleats without internal support. | Stability: No media fluttering or collapse in high-velocity air streams. |
| Frame Durability | Galvanized or Stainless steel options. | Plastic or thin-gauge metal. | Ruggedness: Exceptional resistance to mechanical impact and corrosion. |
| Seal Integrity | Fully secured with universal glue. | Basic mechanical or foam seals. | Zero Leakage: Prevents air bypass, protecting downstream equipment. |
| External dimensions (mm) | Rated air volume (m3/h) | initial resistance (Pa) | Efficiency (Level) (class) | Filter media model
| |
| 295 × 295 × 46 mm | 1000m³ / h | 200-320 | F5-F9 | 45-98% | Non-woven fabrics and synthetic fibers |
| 495 × 295 × 46m | 1600m³ / h | ||||
| 495 × 495 × 46mm | 2800m3/h | ||||
| 595×295×46mm | 2000m3/h | ||||
| 595×495×46mm | 3300m3/h | ||||
| 595×595×46mm | 4000m3/h | ||||
We ensure 100% leak-proof integrity by using professional polyurethane sealant or gel-glue sealant to create an airtight bond between the media and the frame. Chuqi is a leading Custom size nonwoven pocket filter manufacturer also providing non-standard sizes produced upon request for pleated units, including thin thickness (50mm/69mm) or deep-pleat depths (150mm/292mm). Built with a rugged Aluminum alloy vs Galvanized frame, our filters are 80°C / 80% RH Max Operating rated, ensuring durability in the chemical industry, pharmacy, and paint finishing systems.

Q1: Can this filter be customized for very shallow or very deep equipment gaps?
Yes. We specialize in bespoke dimensions, offering thin thickness (50mm/69mm) versions for tight spaces or deep-pleat depths like 150mm and 292mm for maximum capacity. Whatever your AHU housing requires, we provide non-standard sizes produced upon request.
Q2: How does the “Separator Type” design improve performance in heavy industry?
Our Pleated Medium Filter utilizes aluminum foil separators or hot-melt strips to maintain rigid pleat spacing. This prevents the media from vibrating or bunching under a high air flow of 4000m³/h, ensuring consistent filtration and a lower pressure drop.
Q3: Is the filter media moisture-resistant for use in chemical plants?
Absolutely. We offer premium synthetic fiber media combined with a Galvanized steel or stainless steel frame. This construction is rated for up to 80% humidity, making it a highly durable choice for the chemical and oil industries.
Q4: Does this filter help in achieving a better finish in paint spray booths?
Yes. It is specifically applied in paint finishing systems to intercept larger dust particles that cause “fish eyes” or surface defects. Its high capacity ensures stable airflow, which is critical for consistent paint application.
Q5: What is the maximum operating temperature for this industrial model?
The filter is designed for professional industrial use with a maximum operating temp of 80°C, making it suitable for a wide range of industrial air conditioning and warm-air recirculation systems.

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