Understanding Basic Filtration: From G4 to F9 and Beyond

As industries across the world―from mining in Australia to cleanrooms in Singapore―face stricter requirements for air quality, the role of air filters has become more critical than ever. Modern HVAC and industrial ventilation systems no longer rely on a single filter type; instead, they apply multi-stage solutions ranging from coarse prefilters (G1CG4) to medium-efficiency filters (F5CF9), and finally to high-efficiency HEPA or ULPA systems.

Coarse Filtration (G1CG4, including HICLOVER’s G4 Stainless Steel Filters)

Coarse or “primary” filters such as the G4 grade stainless steel prefilter offered by HICLOVER are widely used in mining camps, power plants, and centralized HVAC systems. These filters remove particles ≥5C10 microns, including dust, fibers, and larger aerosols.

Key Features:

• Frame: water-resistant cardboard or stainless steel mesh.

• Media: synthetic fiber non-woven fabric, nylon mesh, or activated carbon options.

• Typical efficiency: 60C90% for coarse particles.

• Applications: prefiltration in central air conditioning, compressor intakes, and as the first stage before roll-type automatic filters.

Advantages:

• Low resistance with high airflow capacity.

• Extended filter life due to large dust holding capacity.

• Lightweight and easily replaceable, reducing operating costs.

Medium Efficiency Filtration (F5CF9 Bag Filters)

Medium-efficiency air filters―commonly bag-type filters made from synthetic or glass fiber media―form the second stage in multi-layer filtration systems. In industries such as semiconductors, pharmaceuticals, and precision machinery, they protect high-efficiency filters by capturing particles in the 1C10 micron range.

Key Features:

• Frame: aluminum alloy, often modular for international HVAC systems.

• Media: multi-layer synthetic fiber or glass fiber.

• Efficiency: 85C95% for PM10, graded from F5 to F9.

• Structures: bag type, panel type, or separator style.

Advantages:

• Stable performance with high dust-holding capacity.

• Good air permeability, making them ideal for continuous ventilation corridors in industrial plants in Europe and North America.

• Easy installation and compatibility across different systems.

Automatic Roll Air Filters: Bridging Pre-Filtration and Efficiency

While coarse and medium-efficiency filters are widely used, large-scale facilities increasingly adopt Automatic Roll Air Filters for prefiltration. HICLOVER’s PLC-controlled system advances filter media automatically when differential pressure rises, reducing manual maintenance. This is particularly beneficial in data centers in Canada, oil and gas ventilation systems in the Middle East, and industrial laboratories across Africa.

By combining G4 stainless steel prefilters, F5CF9 bag filters, and automatic roll filter systems, operators achieve a layered defense against airborne dust and particles, ensuring compliance, extending equipment life, and improving workplace health.

空气过滤基础知识：从G4到F9的应用

随着全球范围内对空气质量的要求日益严格，从澳大利亚矿山到新加坡洁净室，空气过滤器在工业和商业系统中的作用愈发重要。现代空调与工业通风系统已不再依赖单一过滤器，而是普遍采用多级过滤方案，涵盖粗效过滤器（G1CG4）、中效过滤器（F5CF9）以及高效HEPA/ULPA系统。

粗效过滤（G1CG4，含HICLOVER不锈钢G4过滤器）

粗效过滤器，也称为初效过滤器，例如 HICLOVER 提供的 G4不锈钢过滤器，广泛应用于矿区营地、电厂和集中式空调系统。这类过滤器主要拦截≥5C10微米的粉尘、纤维及较大颗粒。

主要特点：

• 外框：防潮纸板或不锈钢框架。

• 滤料：化纤无纺布、尼龙网、活性碳或金属网。

• 过滤效率：60C90%，适用于粗尘过滤。

• 应用领域：中央空调预过滤、大型空压机进气过滤，以及自动卷绕式过滤器的前置保护。

优势：

• 阻力小、过滤面积大。

• 容尘量高、寿命长。

• 重量轻、通用性强，滤料可拆卸更换，降低运行成本。

中效过滤（F5CF9 袋式过滤器）

中效空气过滤器常见为袋式结构，滤料多采用合成纤维或玻璃纤维。在半导体、制药、精密机械等行业中，它们作为高效过滤器的保护层，捕集直径在1C10微米的颗粒。

主要特点：

• 外框：铝合金框架，模块化设计，便于国际化系统兼容。

• 滤料：合成纤维或玻璃纤维，平均效率85C95%。

• 效率等级：F5 至 F9。

• 结构形式：袋式、板式、隔板式。

优势：

• 对1C10微米颗粒有较好捕集效率。

• 性能稳定，透气性好。

• 容尘量大、阻力低，适用于欧洲与北美大型厂房的通风系统。

卷绕式自动空气过滤器：连接预过滤与中效过滤的桥梁

除了粗效与中效过滤器，大型工业场所正逐渐采用 自动卷绕式过滤器。HICLOVER的PLC控制系统能在压差达到设定值时自动卷动滤料，大幅减少人工维护。这一技术在加拿大数据中心、中东油气通风走廊、以及非洲科研实验室中尤其具有优势。

通过组合 G4不锈钢预过滤器、F5CF9袋式过滤器 和 自动卷绕式空气过滤器，可形成多层防护，实现对空气中粉尘和颗粒的高效控制，延长设备寿命，保障员工健康，并满足国际排放与洁净标准。