F5-F9 Medium/Secondary Efficiency Pocket Air Filter

Product Overview

AALFilter’s F5–F9 Medium / Secondary Efficiency Pocket Air Filter is a high-performance filtration solution designed to capture fine airborne particles ≥1μm while maintaining optimal airflow, low resistance, and long-term durability. 

Serving as an effective secondary filter in HVAC and air purification systems, it bridges the gap between coarse filtration and HEPA-level precision. 

Constructed from superfine synthetic fiber (PET) using a seamless, high-strength thermal fusion process, the filter ensures air tightness, minimal leakage, and stable efficiency.

The multi-pocket design maximizes filtration surface area, offering high dust-holding capacity and extending the service life of downstream HEPA filters, ultimately reducing maintenance frequency and cost. 

This filter is ideal for commercial buildings, pharmaceutical cleanrooms, electronics manufacturing, and food processing environments, where consistent indoor air quality is critical. Available in multiple pocket sizes and frame materials to fit standard air handling units (AHUs) and custom HVAC setups.

Key Features

✅ Medium-Efficiency Filtration – Provides higher filtration precision (≥1μm) compared to primary filters, improving indoor air quality.

✅ Multi-Pocket Design – Expands filtration surface area, ensuring high dust-holding capacity and low-pressure drop for optimized performance.

✅ Durable & Tear-Resistant Synthetic Fiber – Made from flexible, anti-tear superfine polyester fiber (PET), with a density gradient structure for enhanced dust capture.

✅ Seamless High-Temperature Fusion Technology – Ensures excellent air tightness and bonding strength, preventing air leakage.

✅ Corrosion-Resistant Frame Options – Available in galvanized steel, aluminum alloy, stainless steel, or plastic frames, offering durability in different environments.

Specifications

· Filtration Class:

o F5, F6, F7, F8, F9 (EN779)

· · Filtration Efficiency:

o 35%, 45%, 65%, 85%, 95% (ASHRAE 52.1-1992)

· Particle Filtration Size: ≥1μm

· Humidity Resistance: ≤100% RH

· Temperature Resistance:

o Continuous: ≤100°C

o Instantaneous: ≤120°C

· Filter Material: Flexible, anti-tear superfine polyester fiber (PET)

· Frame Options:

o Galvanized steel

o Aluminum alloy

o Stainless steel

o Plastic

Applications

The Medium/Secondary Synthetic Fiber Pocket Air Filter is widely used in Commercial HVAC systems, air handling units, and industrial ventilation, particularly in environments requiring higher air purity than primary filtration can provide.

✅ HVAC & Commercial Buildings: Used in offices, hospitals, hotels, and shopping malls for improved indoor air quality.

✅ Industrial Manufacturing: Applied in factories, cleanrooms, and workshops where higher-efficiency air filtration is required.

✅ Chemical & Energy: Suitable for chemical plants, energy facilities, and refineries, offering high-performance dust removal.

✅ Healthcare & Pharmaceuticals: Essential for hospitals, laboratories, and pharmaceutical production, where enhanced air purity is critical.

✅ Food & Beverage: Used in food processing plants and beverage production facilities to reduce airborne contaminants.

✅ Transportation: Applied in airports, train stations, and vehicle ventilation systems for secondary filtration.

✅ Agriculture: Ideal for greenhouses, livestock farms, and poultry production where airborne particles need to be controlled.

✅ Automotive: Used in paint booths, manufacturing facilities, and ventilation systems to enhance air quality and reduce particulate contamination.