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
G4 Primary Bag Filter | Needle Punched Media with EVA Gasket Seal
Protect your cleanroom environment with our G4 Primary Bag Filter, engineered for precise pre-filtration. Every unit is fitted with an EVA gasket to ensure zero bypass air, crucial for cleanroom intake systems. With depth options of 500mm and 600mm, this Primary Pocket Filter maximizes particle capture for suspended particles above 5μm, providing an essential protective layer for your secondary and HEPA filtration stages in hospitals and laboratories.
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Product Key Features
Leak-Proof Gasket: High-quality EVA gasket provides an airtight seal between the filter and the frame.
Wide Dimension Range: Available in standard sizes from 495x295x500mm to 595x595x600mm.
Reliable Arrestance: Delivers 35-45% G4 efficiency, effectively filtering large dust loads.
High Resistance to Humidity: Operates at 80% RH, preventing media sagging in high-humidity zones.
Material & Craftsmanship
Sealing Material: Professional-grade EVA sealant/gasket.
Filter Core: Needle punched synthetic fiber for high dust holding capacity.
Frame Construction: Precision-cut Aluminum alloy or galvanized steel.
Applications
Medical & Pharma: Provides sterile air intake for hospitals, laboratories, and pharmaceutical manufacturing plants.
Automotive Painting: Ensures a dust-free environment as a high-performance spray booth intake filter.
Electronics Industry: Crucial cleanroom pre-filtration for semiconductor and precision electronics production.
Food & Beverage: Reliable, moisture-resistant filtration for hygienic food processing and packaging zones.
Commercial HVAC: High-capacity pre-filtering for office buildings, data centers, and shopping malls.
Competitive Comparison
| Feature | Chuqi G4 Filter (With Gasket) | Standard Bag Filters |
| Sealing | EVA Gasket: 100% airtight, no bypass. | No Gasket: High risk of dust leakage. |
| Media | Needle Punched: High dust load, no shedding. | Basic Fiber: Prone to fiber shedding. |
| Humidity | 80% RH Resistant: No sagging in moisture. | Weak: Softens and loses efficiency in rain/fog. |
| HEPA Life | Extended by 30%+: Heavy-duty protection. | Shortened: Forces frequent HEPA replacement. |
Specifications
| Size / WxHxD (mm) | Airflow Capacity (m3/h) | Initial Pressure Drop (Pa) | Filter Class (e.g., G4) (class) | Filter Color
| Pockets / Bags
|
| 495×295×500mm | 1500m3/h | 70Pa
| 25-35% G3
35-45% G4 | White | 5 |
| 495×495×500mm | 2500m3/h | 5 | |||
| 595×295×500mm | 2000m3/h | 6 | |||
| 595×495×500mm | 3200m3/h | 6 | |||
| 595×595×500mm | 3800m3/h | 8 | |||
| 495×295×600mm | 1800m3/h | 5 | |||
| 495×495×600mm | 3200m3/h | 5 | |||
| 595×295×600mm | 2500m3/h | 6 | |||
| 595×495×600mm | 4000m3/h | 6 | |||
| 595×595×600mm | 4500m3/h | 8 |
With 20 years of manufacturing expertise, Chuqi is a leading specialist in industrial air filtration, dedicated to delivering high-performance solutions for cleanrooms and HVAC systems. Our core strength lies in our Zero-Leakage Sealing Technology, utilizing professional EVA gaskets to eliminate air bypass and ensure maximum system integrity. As a direct manufacturer, we offer customized OEM/ODM services using premium needle-punched media, helping global B2B clients extend the lifespan of their HEPA filters by over 30% while maintaining superior air quality standards.
Frequently Asked Questions
Q1: Why is the EVA gasket seal so important for this filter?
A: The EVA gasket provides a critical airtight seal between the filter frame and the holding bank. In cleanroom environments, even a tiny gap can cause “air bypass,” allowing unfiltered dust to leak into the system. Our gasket ensures 100% leak-proof performance, protecting your expensive secondary and HEPA filters.
Q2: How often should I replace the G4 Primary Bag Filter?
A: Generally, we recommend replacement every 3 to 6 months, depending on your local air quality and dust load. Monitoring the pressure drop is the best way—when the resistance reaches 200-250 Pa, it’s time for a new one to maintain optimal airflow and energy efficiency.
Q3: Can your filters handle high-humidity environments?
A: Yes. Our filters use needle-punched synthetic media, which is naturally moisture-resistant. It can operate effectively in environments with up to 80% relative humidity (RH) without sagging, softening, or losing its filtration structure.
Q4: Do you offer custom sizes for specific HVAC systems?
A: Absolutely. As a direct manufacturer, we provide full OEM/ODM services. While 595x595mm and 495x495mm are standard, we can customize the width, height, and pocket depth (e.g., 500mm or 600mm) to fit your specific equipment perfectly.
Q5: Does this G4 filter comply with international standards?
A: Yes, our products are manufactured to meet G4 efficiency (EN779) standards, equivalent to MERV 7-8 (ASHRAE 52.2). They are designed to capture 90%+ of particles larger than 5μm, providing professional-grade pre-filtration for industrial and medical use.
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