Medium Filters
Medium Filter
SKU: MEDIUM
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ISO 9001:2015 Certified · 12-Month Warranty
| Standard | EN 779 |
|---|---|
| Grade range | F6 – F9 |
| Avg efficiency (0.4 µm) | 60–80% (F6) — ≥ 95% (F9) |
| Min intrusive particle | 0.5 µm |
| Construction | Separator / Mini-pleat / Bag |
What is a Medium Filter?
The English word "medium" itself means intermediate.
A Medium Filter is therefore an intermediate filter: it is not the first filtration stage, but sits between the coarse pre-filter and the fine final filter. It is widely deployed in central air-handling units (AHUs) of commercial HVAC and cleanroom systems.
How a Medium Filter Works
A Medium filter is essentially a mesh of randomly arranged fibres. The media can be made of carbon fibre, fabric, or filter paper / cloth (such as Puchikpo) — selected to meet a grade between F6 and F9 per EN 779.
A Medium filter can remove up to 95% of coarse dust and any airborne particle down to a minimum intrusive particle size of 500 nanometres (0.5 µm).
Construction Types
Three basic constructions are available:
- Separator — rigid pleats held apart by metal/paper separators.
- Mini-pleat — densely pleated for high media area in a thin form factor.
- Bag — pocket / bag form, high dust-holding capacity for AHU side-access slots.
Compare Medium Grades (EN 779)
- Filter media: carbon fibre, fabric, Puchikpo filter paper, or filter cloth — chosen to match the F-grade band.
- Up to 95% dust removal with a minimum intrusive particle size of 0.5 µm.
- Designed to extend the life of the terminal HEPA filter by loading first.
- Used predominantly in air-handling units (AHUs) for commercial and industrial HVAC.