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
F9 High Efficiency Pleated Panel Filter with Cardboard Frame
Why Choose Chuqi as Your F9 Cardboard Panel Filter Supplier? Protect your critical production lines with our F9 High Efficiency Pleated Panel Filter with Cardboard Frame. Delivering a certified 95-98% filtration efficiency for sub-micron particles, this Eco-friendly cleanroom air filter serves as an essential secondary filtration stage to extend the lifespan of expensive terminal HEPA filters in pharmacy and electronics sectors. Precision pleat spacing ensures uniform airflow and ultra-low resistance.
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Product Key Features
- Elite Particle Capture: Reaches F9 efficiency class, effectively blocking fine atmospheric dust and microorganisms.
- Airtight Integrity: Equipped with a high-density EVA gasket strip to ensure a vibration-proof, leak-free mechanical seal.
- Structural Stability: Utilizes hot-melt separators or internal support grids to prevent pleat deformation at high pressure.
Material & Craftsmanship
- Core Media: High-performance fiber glass paper media for precision particle retention.
- Sealant: Professional gel-glue sealant ensuring a 100% bond between the media and the aluminum frame.
- Temperature Limit: Rated for a maximum operating temp of 80°C and 80% humidity.
Applications
Pharmaceutical Aseptic Packaging: A critical secondary filtration stage for pharmaceutical cleanrooms, ensuring air purity levels meet strict GMP standards for drug filling and packaging.
Semiconductor Lithography Zones: Protects ultra-sensitive semiconductor manufacturing equipment from sub-micron dust particles that can cause circuit defects.
Hospital Operating Theaters: Provides high-efficiency air cleaning for medical environments, effectively capturing fine atmospheric dust and airborne contaminants.
Electronics Curing Ovens: Serves as a high-performance oven air filter (rated up to 80°C) for precision electronics drying, preventing surface contamination.
HEPA Filter Life Extension: Acts as a specialized high-efficiency shield for terminal HEPA filters, capturing up to 98% of 1-5μm particles to reduce the replacement frequency of expensive terminal units.
Competitive Comparison
| Feature | Chuqi Precision Cleanroom Shield (F9) | Standard Medium Filters (F7/F8) | The Chuqi Advantage | |
| Filtration Efficiency | F9 Grade (95-98% @ 0.5μm). | Typically 60-90% efficiency. | Superior Purity: Blocks sub-micron particles for sensitive processes. | |
| Sealing Technology | Gel-glue sealant & EVA Gasket. | Basic mechanical seal or foam. | Zero Bypass: 100% airtight bond ensures no unfiltered air leakage. | |
| Airflow Capacity | Optimized for high air flow (up to 4000m³/h). | Prone to efficiency drop at high flow. | High Performance: Maintains clean air standards in high-velocity AHUs. | |
| Frame Material | Anodized Aluminum Alloy. | Standard galvanized steel. | Corrosion Resistance: Cleanroom-grade materials prevent oxidation. | |
| Surface Area | Deep pleat structure. | Shallow pleat or bag-style. | Stable Efficiency: Low pressure drop with a high dust holding capacity. |
Specifications
| 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 | ||||
Massive Dust Capacity for Extended Service Life
Our Deep Pleat Medium Filter features a high-surface-area design that provides a massive area for particulate retention. With the ability to capture up to 1120g of dust, it offers an industry-leading long service life. This High dust holding capacity reduces the frequency of filter replacements and lowers maintenance labor costs, making it a superior secondary filtration choice for general air purification in large-scale commercial and industrial facilities.
Frequently Asked Questions
Q1: Why is the F9 efficiency rating crucial for pharmaceutical and electronics industries?
Our High capacity F9 air filter targets fine sub-micron particles with up to 98% efficiency. In industries like pharmacy and electronics, this level of filtration is essential to prevent micro-contamination that could ruin a production batch or damage sensitive wafers.
Q2: What is the benefit of using “Gel-glue sealant” in this model?
Unlike standard filters that use mechanical clamping, our filter utilizes a professional gel-glue sealant to bond the media to the Aluminum alloy frame. This creates a permanent, airtight seal that eliminates “air bypass,” ensuring every cubic meter of air is thoroughly filtered.
Q3: Can this pleated filter handle the large air volumes of an industrial AHU?
Yes. It is specifically designed to handle a high air flow of up to 4000m³/h. The rigid separator type or reinforced pleat design prevents the media from fluttering or collapsing even under high-velocity air streams.
Q4: Does this filter work in high-humidity cleanroom environments?
Absolutely. The filter is rated for a max operating humidity of 80%. Combined with an anodized aluminum frame, it is highly resistant to corrosion and moisture, making it ideal for the chemical industry or humid sterile suites.
Q5: How often should I replace this filter to protect my terminal HEPA filters?
While it has a high dust holding capacity and a long service life, we recommend monitoring the pressure drop. Because it serves as a high-performance secondary filtration stage, replacing it on time can extend the life of your expensive terminal HEPA filters by 2-3 times.
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