Air Pre-filters

What is Air Pre-filters?

Pre-filters also known as main filters or primary filters, are an essential component commonly found in most air purifiers or air purification equipment, serving as the initial line of defense against larger particles in the air. The preliminary filter is the primary filter of the air conditioning system and is mainly used for filtering dust particles above 5μm. The initial filter is available in panel plate, folding and bag styles. Its key features and benefits include:

• Particle Capture: Designed to capture substantial particles like dust, oil, carbon, pipe scale, rust, rubber, dirt, and sand, the pre-filter effectively prevents these contaminants from progressing further into the air purification system.
• Visible Pollutant Removal: In air purifiers, pre-filters efficiently remove visible pollutants such as dust, pollen, and fibers before the air undergoes subsequent purification stages.
• Protection for Sterilizing Filter: Acting as a protective barrier for the subsequent sterilizing filter and HEPA filters, the pre-filter ensures that larger particles, including street debris, are intercepted. By preventing larger contaminants, such as street debris, from entering and potentially clogging the pleats of the air filter, pre-filters significantly contribute to maintaining optimal system performance.
• Reliable Defense Mechanism: In HVAC systems, pre-filters serve as a reliable defense mechanism by trapping large particles like dust, oil, carbon, pipescale, and rust.
• Prolonged Service Lives: The presence of pre-filters ensures extended service lives across all filter stages within HVAC systems.
• Reduced Maintenance Efforts: The implementation of pre-filters translates to reduced maintenance efforts, as their efficient particle capture minimizes the need for frequent filter replacements.
• Cost Efficiency: By contributing to lower overall maintenance costs, pre-filters ensure maximum protection for the entire air purification or HVAC system, making them a cost-effective and essential component.
• Application: Pre-filters can be used in many industries, including: Hotels and malls, Pharmaceutical processing, Food industry, Automotive, Power plants, Turbine gas.

What Types of Air Pre-Filters?

We usually classify the types of preliminary filters from:

Filter media:

• Synthetic Fiber
• Synthetic cotton
• Nylon Mesh
• Metal Mesh
• Glass Fiber
• Activated Carbon Non-woven Fabric
• Activated Carbon Granule Filter

Synthetic Fiber Panel Plate Air Pre Filter

Synthetic cotton with Protection Grid Plate Air Pre Filter

Nylon Mesh Panel Plate Air Pre Filter

Metal Mesh Plate Air Pre Filter

Glass Fiber Plate Air Pre Filter

Activated Carbon Non woven Fabric Air Pre Filter

Classify the frame materials:

• paper frames
• plastic frames
• aluminum frames
• galvanized iron frames
• stainless steel

Classify the protective meshes/Protection Grid:

• Wire Protection Grid
• Galvanized Protection Grid

Galvanized Protection Grid Air Pre Filter

Synthetic cotton with Protection Grid Plate Air Pre Filter

The filter media is closely combined with the protection grid and processed into a contour, equal spacing filter pleat layer by special process allowing the air to pass freely and evenly so that the dust can be uniformly adsorbed on the entire media thereby achieving high dust holding capacity.

Classify the using

• Washable Pre-filters:Practical and easy to maintain. Can be washed, vacuumed, or rinsed, offering long-lasting use without frequent replacements.
• Carbon Pre-Filters:Standard in the market, coated with carbon. Positioned before HEPA filters, serving as a first-stage filter to capture larger particles.

Primary Filter Structure

• The outer frame of the filter consists of a sturdy waterproof sheet to fix the folded filter material. The diagonal design of the frame provides a large filter area and allows the internal filter material to adhere tightly to the frame. The perimeter of the filter is bonded with a special professional adhesive glue to the frame to prevent air leakage or damage due to wind resistance pressure.
• The outer frame of the disposable paper frame filter is generally divided into a general cardboard frame and a high-strength die-cut cardboard, and the filter element is a pleated fiber filter material lined with a single-faced wire mesh. Beautiful appearance, Rugged and durable structure. General cardboard frame for the manufacture of non-standard filter, can be used for any size filter production, high strength, not easily deformed. High-strength die-cut cardboard is used for the manufacture of standard-sized filters, characterized by high specification accuracy and low aesthetic cost. If the imported surface fiber or synthetic fiber filter material is used, its performance indicators can meet or exceed the import filter.
• The filter material is folded into a high-strength die-cut cardboard, increasing the windward side area. Dust particles in the inflow air are effectively blocked by the filter material between the pleats and the pleats. The clean air flows evenly from the other side, so the air flow through the filter is gentle and uniform. Depending on the filter material, the particle size that it blocks varies from 0.5μm to 5μm, and the filtration efficiency is also different.

What is the difference between air Pre-Filters, Medium Filters and HEPA Filters?

It’s crucial to understand that while a pre-filter plays a significant role in capturing larger particles, it doesn’t match the efficiency of Medium Pocket Filter and HEPA filters. Here are key points to consider regarding Class and Purification Efficiency:

• Pre-Filters: A standard pre-filter typically exhibits an efficiency range between 20% and 70%. This level of efficiency makes it effective in capturing particles sized between 3 and 10 microns. And the Class is from G1 to G4, efficiency arrestance 40%,65%,80%,90%.
• Medium Filters: A medium filter is a type of AHU filter with an efficiency class range of F6 to F9, filter dust particles 1μm~5μm, Efficiency : 45%, 70%, 85%, 95%, wildly used in air condition systems
• HEPA Filters: A HEPA filter can remove 99.97% of mold, bacteria, pollen, and dust from the air, can capture particulate dust and various suspended substances, with a particle size below 0.5μm; The Filtration Grade is from H10 to H14, efficiency arrestance 95%,99.5%,99.95%,99.995%,99.9995%

Custom Designs

Pre-filters Can be customized with different filter media and frames

Common Specification