How to Choose the Right Air Filtration Filter Cloth?

Selecting the right air filtration filter cloth requires comprehensive consideration of factors such as filtration efficiency, operating environment, material properties, and cost. Using the right air filtration filter cloth can significantly increase filtration efficiency and save time.

1. Clarify Filtration Requirements
Filter Purpose
Particulate matter filtration (such as dust, pollen, PM2.5): Focus on the filter cloth's pore size and retention efficiency.
Chemical gas/odor filtration (such as formaldehyde, VOCs): Choose activated carbon composite filter cloth or chemical adsorption material.
Microbial filtration (such as bacteria, viruses): Require medical-grade HEPA or antimicrobial-coated filter cloth.

Application Scenarios
Industrial (workshops, welding fumes): High-temperature-resistant, high-dust-holding coarse/medium-efficiency filter cloth.
Household (air conditioners, air purifiers): Medium- and high-efficiency non-woven fabric or HEPA.
Laboratory/cleanroom: Ultrafine glass fiber or PTFE membrane filter cloth.

2. Key Performance Parameters
Filtration Efficiency
Referring to international standards (such as EN1822 and ISO16890):
Primary filter cloth (G1-G4): Filters particles ≥5μm with an efficiency of <90%.
Medium filter cloth (M5-M6): Filters particles 1-5μm with an efficiency of 90%-95%. High-efficiency filter fabric (H11-H14): Filters particles 0.3μm in size with an efficiency of ≥99.95% (HEPA standard).

Air Permeability (Pressure Drop)
Higher air permeability (e.g., ≥100 L/m²·s) reduces wind resistance, making it suitable for high-volume equipment, but may sacrifice some filtration accuracy.

Dust Holding Capacity
High-dust-holding filter fabrics (such as meltblown nonwovens) offer a longer service life and are suitable for dusty environments.

Temperature Resistance
Normal temperature (≤80°C): Polyester (PET) nonwoven fabric.
High temperature (100-260°C): Glass fiber or sintered metal mesh.

3. Comparison of common filter cloth materials

4. Other Selection Factors

Service Life
Washable filter fabrics (such as PET non-woven fabrics) are economical, but HEPA filters are generally not reusable.

Safety
Choose filter fabrics that are flame-retardant (UL94 certified) or have antimicrobial treatments (such as silver ion coatings) for use in specialized environments.

Size Compatibility
Ensure that the filter fabric fits snugly within the device frame to prevent air leakage (for example, home air purifier filters must be compatible with the original manufacturer).