A question VAF often receives: "How often do I have to change the filter?". The answer does not lie in time (3 months or 6 months), but in pressure difference.
1. Pressure Drop rule
Each filter has the parameter "Recommended Final Resistance". Normally:
- Coarse filter (G4): Replace when differential pressure reaches 250 Pa.
- Filter bag (F7-F9): Replace when differential pressure reaches 450 Pa.
- HEPA filter (H13-H14): Replace when the differential pressure reaches 600 Pa (or double the initial differential pressure).
2. Risk of not changing the filter on time
If you try to use a filter that is clogged with dust, you will face:
- Power consumption: The fan must run at full capacity to push air through the clogged filter.
- Filter platform: Too much wind pressure can tear the filter paper, causing dust to flood into the clean room (very serious consequences).
- Reduce air flow: The room does not have enough air exchange times, the dust concentration increases.
