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Pocket Filter, also called bag filter, is the standard medium-efficiency secondary filtration component for air handling units (AHU) in all grades of cleanrooms. It is installed behind G3/G4 primary pre-filters and before V-bank HEPA terminal filters, capturing fine 1–5μm airborne particles, dust, pollen and microbial aerosols that primary filters cannot intercept.
Multi-bag pocket design greatly expands the effective filtration area, achieving larger dust storage capacity and longer service life compared to flat panel pre-filters. It stabilizes air quality before high-efficiency filtration, effectively extending the service cycle of expensive H13/H14 HEPA filters and lowering long-term system maintenance cost, complying with EN779 / ISO16890 cleanroom HVAC design standards.
Three frame options for different working environments:
Aluminum alloy frame (Standard Cleanroom Grade)
Lightweight, anti-rust, oxidation-resistant, precise size matching universal AHU filter racks, easy on-site disassembly and replacement, the most popular choice for pharmaceutical and hospital ventilation systems.
Galvanized steel frame (Economical Industrial Type)
High structural rigidity, low cost, suitable for electronics factory and commercial HVAC fresh air units.
SUS304 stainless steel frame (Premium Corrosion-Resistant Type)
Resistant to alcohol, hydrogen peroxide and chlorine disinfection mist, designed for high-humidity sterile food workshops and chemical labs.
Standard frame thickness: 20mm; customizable pocket depth (500/600/700mm) and pocket quantity (4/6/8/10/12 pockets per unit).
Material: Gradient progressive-density polyester non-woven fiber, electrostatic-charged for stable filtration efficiency; fiberglass media optional for long-term efficiency retention without static attenuation.
Craft: Ultrasonic seamless welding for all pocket seams, no glue overflow or fiber shedding, avoiding secondary particle pollution to clean zones.
Color coding for easy grade identification (industry universal standard):
F5: White | F6: Light Green | F7: Pink | F8: Yellow | F9: Deep Yellow
Performance: Multi-layer loose-to-dense structure traps particles layer by layer, ultra-high dust holding capacity, slow pressure rise during long-term operation.
Internal galvanized metal support strips keep pockets expanded under high airflow, prevent bag collapse and airflow blockage.
PU foam sealing gasket pre-mounted on frame edge to eliminate air bypass leakage between filter and AHU cabinet.
Grade | Average Efficiency | Captured Particle Size | Main Application Position in Cleanroom AHU |
|---|---|---|---|
F5 | 40–60% (ASHRAE dust spot) | ≥5μm coarse fine dust | Secondary filter for low-grade ISO8 cleanrooms, fresh air pre-protection |
F6 | 60–80% | ≥3μm fine particles | Standard secondary filter for electronics & cosmetic ISO7/8 workshops |
F7 | 80–90% (ePM2.5 ≥50%) | ≥2.5μm fine aerosol | Mandatory secondary filter for hospital OR, general pharmaceutical cleanrooms |
F8 | 90–95% (ePM1 ≥65%) | ≥1μm ultra-fine dust | Pre-protection for V-bank H14 HEPA in aseptic filling workshops |
F9 | ≥95% (ePM1 ≥80%) | Submicron particles | High-standard secondary filter for Class100 ISO5 pharmaceutical Grade A/B zones, EU GMP Annex 1 required configuration |
Filtration test standard: EN779:2012, ISO16890, ASHRAE 52.2 MERV10–MERV14
Cleanroom specification: ISO 14644-1, EU GMP Annex 1 pharmaceutical HVAC requirements
Material certification: CE, ISO9001, RoHS non-toxic environmental test
Operating environment: Continuous working temp ≤70°C, relative humidity up to 100% RH (non-condensing)
