When choosing an MVHR (Mechanical Ventilation with Heat Recovery) filter grade between G3, G4, and M5, it’s important to consider your air quality needs, system compatibility, and maintenance capacity. Here’s a breakdown to help you decide:
G3 Filter (Coarse Filter)
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Particle Filtration: Captures larger particles like dust, hair, and pollen.
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Efficiency: Around 80–90% for particles ≥10 μm.
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Best for: Basic protection, rural or clean environments.
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Pros: Low pressure drop, cheaper.
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Cons: Doesn’t filter finer particles (e.g., fine dust, soot, allergens).
G4 Filter (Improved Coarse Filter)
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Particle Filtration: Slightly better than G3; captures smaller coarse particles.
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Efficiency: Up to 90–95% for particles ≥10 μm.
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Best for: Standard residential use in moderate air quality environments.
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Pros: Good balance of filtration and airflow, affordable.
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Cons: Still not effective against fine particles (e.g., PM2.5).
M5 Filter (Fine Filter / ISO ePM10)
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Particle Filtration: Filters finer particles, including many allergens and some PM10.
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Efficiency: 40–60% of particles between 1–10 μm.
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Best for: Urban areas, homes with allergy sufferers, or improved indoor air quality.
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Pros: Better air quality, improves health and HVAC performance.
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Cons: Higher cost, higher pressure drop (ensure your system can handle it).
Recommendation
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Urban or polluted areas: Go with M5 for better protection against pollutants and allergens.
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Standard environments: G4 is usually the best compromise between filtration efficiency and system load.
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Minimal filtration needs or limited budget: G3 may be sufficient, but it’s the least protective.
Always check your MVHR unit’s compatibility .