Filter class for retention of thick dust up to 100μm
ASHRAE | EN779 | ISO16890 |
EFFICIENCY 450 Pa 0,3 - 10μm |
AVERAGE ARRESTANCE at 250 Pa |
---|---|---|---|---|
MERV1 | G1 | ISO COARSE <20% | <20% | <65% |
MERV2 | G1 | <65-70% | ||
MERV3 | G2 | ISO COARSE <30% | <20% | <70-75% |
MERV4 | G2 | <75-80% | ||
MERV5 | G3 | ISO COARSE <50% | <20% | <80-85% |
MERV6 | G3 | <85-90% | ||
MERV7 | G4 | ISO COARSE <60% | <20% | >90% |
MERV8 | G4 | >90% |
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