Choosing the right air filter is essential for maintaining indoor air quality, ensuring equipment performance, and meeting industrial standards. As a professional air filter manufacturer and air filter supplier, E-FILT specializes in a full range of filtration solutions—from pre-filters and medium-efficiency units to HEPA air filters designed for cleanrooms and sensitive environments. Whether you’re sourcing from an air purifier factory, seeking a reliable air filter exporter, or looking for OEM HEPA filter manufacturers, this guide offers a practical overview of the different filter types and their applications to help you make informed decisions.
Types of Air Filters and Their Features
1. Primary Efficiency Air Filter (Pre-filter)
Applications: Used as the first-stage filter in general ventilation air handling units or fresh air systems.
Features: Filter media can be replaced independently; cardboard frame types are disposable.
Applicable Scope: Ideal for primary filtration in HVAC systems, primarily capturing particles larger than 5μm.
Primary filters are available in flat-panel, pleated, and bag-style formats. Frame materials include cardboard, aluminum, and galvanized steel. Filter media options include non-woven fabric, nylon mesh, activated carbon material, and perforated metal mesh. Protective screens come in double-sided powder-coated or galvanized wire mesh.
Advantages: Low cost, lightweight, versatile, compact structure.
Main Applications:
a. Pre-filtration for central air conditioning and ventilation systems
b. Pre-filtration for large-scale air compressors
c. Clean air return systems
d. Pre-filtration for local high-efficiency units
e. High-temperature air filters (with stainless steel frames), resistant to 250–300°C
G-Series Primary Air Filters: Low resistance, high airflow, long service life.
G-series includes: G1, G2, G3, G4, GN (Nylon Mesh Filter), GH (Metal Mesh Filter), GC (Activated Carbon Filter), GT (High-Temperature Coarse Filter).
2. Pleated Medium Efficiency Air Filter
Applications: General air purification in ventilation systems across industries such as electronics, pharmaceuticals, machinery, metallurgy, petrochemicals, light industry, and food.
Features: High efficiency, large dust-holding capacity, compact design.
3. Bag-Type Medium Efficiency Air Filter
Applications: Used in central air conditioning and ventilation systems, or as a pre-filter for high-efficiency filters to extend their lifespan. Also suitable for general industrial air purification.
Features: Low resistance, high dust-holding capacity.
Medium filters are typically installed in central HVAC systems. They can serve as primary filters to protect downstream components. In areas with moderate cleanliness requirements, air treated by medium filters can be delivered directly to users.
Particle Size Efficiency: 1–5μm, with 60–95% efficiency (colorimetric method).
Key Functions:
– Capture 1–5μm particles
– Available in frameless or framed bag styles
– Media: Special non-woven fabrics or fiberglass
– Efficiency: 60%–95% @ 1–5μm (colorimetric method)
F-Series Medium Efficiency Filters: Includes bag types (F5–F9) and non-bag types: FB (Panel), FS (Separator Type), FV (Modular).
GK-Series HEPA Filters
Applications: Used in microelectronics, precision instruments, healthcare, biotechnology, pharmaceuticals, food processing, cleanrooms, clean tunnels, clean benches, air showers, and other end-stage filtration systems.
Construction: Ultra-fine fiberglass media, hot melt separator, aluminum frame, polyurethane sealant, closed-cell sponge gasket, powder-coated steel flow equalizer.
Features:
– Captures 0.1–0.5μm particles
– Separatorless design with aluminum frame
– Media: Ultra-fine fiberglass paper
– Efficiency: 99.999% @ 0.3μm (DOP method)
4. Activated Carbon Filter
Applications: Effectively removes odors, VOCs, bacteria, viruses, and various air pollutants such as paint fumes, smoke, and industrial contaminants. Also used in food processing and medical facilities.
Features: Highly porous structure with high adsorption capacity, fast adsorption/desorption, and effective purification.
Note: Requires a pre-filter to maintain efficiency. Suitable for standard housings. Contains over 63% carbon by weight.
5. Nylon Mesh Filter
Applications: Used as a pre-filter in ventilation systems with low air quality requirements or in dusty, harsh environments.
Features: Low resistance, washable, easy maintenance.
6. Sub-HEPA Filter (Semi-High Efficiency Filter)
Applications: Terminal filtration for cleanrooms, central air systems, and process ventilation systems with special requirements.
Features: High efficiency, low resistance, large dust-holding capacity.
7. HEPA Filter (High-Efficiency Particulate Air Filter)
Applications: Clean air conditioning systems and high cleanliness environments.
Features: High efficiency, low resistance.
Types:
– With Separator: Standard HEPA, high-temperature, high-humidity HEPA
– Separatorless: Modular HEPA, separatorless HEPA, liquid seal HEPA, ultra-low resistance HEPA, knife-edge HEPA, 0.1μm ultra-HEPA
8. High-Capacity HEPA Filter
Applications: Terminal high-performance filter in air handling units.
Features: High efficiency, large airflow, large dust-holding capacity.
9. Aluminum Mesh Panel Filter
Applications: Pre-filter for ventilation systems in dusty or oily environments with low air quality requirements.
Features: Durable and washable.
With years of industry experience and a global client base, E-FILT is committed to delivering reliable, efficient, and customizable air filtration solutions. From HVAC systems to medical cleanrooms, our products meet international quality standards and support OEM/ODM requirements. If you’re looking for a trusted HEPA air filter manufacturer, a dependable air filter exporter, or an innovative air purifier factory, E-FILT is your one-stop solution. Contact us today to learn more about our OEM services and bulk supply options for international partners.
