Panel, pocket, V-bank or HEPA
Selection by grade cascade, dust holding, dimensions, airflow and allowable pressure drop for AHUs and clean areas.
How to build a ventilation cascade
The first stage removes coarse dust, the intermediate stage protects the final filter and the final stage delivers the target cleanliness. The cascade is built so that the higher-value final stage does not take the coarse dust and does not reach its terminal pressure drop quickly.
Check the solution against total ΔP, dust holding, moisture, frames and fan capacity. G3–F9 identify legacy requirements; a new selection needs test evidence to the applicable ISO 16890 edition, and there is no universal direct conversion between grades.
From prefilter to final stage
Flat and pleated prefilters: coarse cleaning, coarse dust. Check dust holding, moisture and fire behaviour.
Look inside →02POCKETPocket filtersG3–F9: high dust holding at an economical price; the intermediate and final AHU stage. Check airflow, initial and terminal ΔP.
Look inside →03V-BANK CELLV-bank filtersHigh area and stable geometry in a short depth; F7–F9 for the fine final or pre-HEPA stage. Check the efficiency report and fan energy.
Look inside →04HEPAEPA / HEPA filtersMini-pleat or separator panel for clean areas and critical processes, only with a verified class, individual test and installation leak-tightness.
Look inside →Legacy labels are shown alongside test data
G3–F9 labels help identify existing replacements, while project selection uses test data to the applicable ISO 16890 edition, airflow and ΔP.
- Typical role
- Coarse prefiltration
- Construction
- Panel, cell or pocket
- Verify
- Dust holding, moisture and fire behaviour
Temperature and humidity are confirmed by the specific filter datasheet. A media limit must not be applied to the complete cell: frame, sealant, separator and gasket may impose a lower rating.
Data for a replacement or a new design
- 01Size
Width, height, depth, frame, number of pockets and gasket.
- 02Air
Airflow, temperature, humidity, outdoor or recirculated duty.
- 03Requirement
Grade, test report, allowable ΔP, final cleanliness and service life.
- 04System
AHU model, fan, frames, number of stages and service access.
Frequently asked questions
Can F7 be directly replaced by ePM1?
There is no universal conversion. G/F are legacy EN 779 grades; ISO ePM belongs to ISO 16890. Compare the product test report, airflow, initial and terminal ΔP, dimensions and the project requirement.
Is a pocket or a V-bank filter better?
Pockets offer economical dust holding; V-bank cells provide high area and stable geometry in a compact depth. Space, moisture, ΔP and lifecycle cost decide.
Why does a filter collapse or tear?
Potential causes include excess airflow, a blocked stage, a weak frame, wetting, wrong orientation or missing support. Inspect both the aerodynamics and the installation.
When is HEPA required?
When the final cleanliness and the process risk assessment require a high-efficiency final stage. HEPA must come with a verified class and installation leak-tightness control.
On this topic
3DWhy legacy grades cannot be mechanically converted to new ones and what a test report must show.
Open →Ventilation & clean air
3DG3–F9, ePM, HEPA and ULPA: panels, pockets, V-bank, compact cells and final filters — selected by airflow, ΔP, climate and required cleanliness, from ordinary ventilation to ISO 5 cleanrooms.
Open →TroubleshootingSymptom → cause → check → action: a matrix for high ΔP, dust leakage, short life, wet cake and unstable measurements.
Open →An engineer will answer your question
We review the specification, identify missing measurements and propose a process arrangement and supply scope.