In this article, we explore the different air filter efficiency standards: MERV, EN779, and ISO 16890. Understanding these standards is crucial for selecting the right air filter for various applications. We will explain each standard and provide a detailed table showing the filtration grades and types of particles they capture.
Air Filter Efficiency Standards
MERV (Minimum Efficiency Reporting Value): A North American standard that rates filters based on their ability to trap particles of different sizes, ranging from MERV 1 to MERV 16, with higher numbers indicating higher efficiency.
EN779: A European standard that categorises filters into classes G1 to F9 based on their ability to capture synthetic dust particles.
ISO 16890: A global standard that measures filter efficiency based on their ability to capture particulate matter (PM) across different size ranges, including ePM10, ePM2.5, and ePM1.
Air Filter Efficiency Chart
|
EN779 Class |
MERV Rating |
ISO 16890 |
Micron Size Captured |
Captured Contaminants |
| G2 | MERV 2 | Coarse 40% | >10 microns | Dust Mites |
| MERV 3 | ||||
| MERV 4 | ||||
| G3 | MERV 5 | Coarse 50% | 3.0-10 microns | Hair Spray |
| MERV 6 | ||||
| G4 | MERV 7 | Coarse >90% | ||
| MERV 8 | ||||
| M5 | MERV 9 | ePM10 ≥50% | 1.0-3.0 microns | Legionella |
| MERV 10 | ||||
| M6 | MERV 11 | ePM10 >60% | ||
| MERV 12 | ||||
| F7 | MERV 13 | ePM2.5 >65% | 0.3-1.0 microns | Bacteria |
| F8 | MERV 14 | ePM1 70% | ||
| F9 | MERV 15 | ePM1 >80% | <0.3 microns | Virus Carriers |
| MERV 16 |
MVHR Filtration Grades: G2 to M5
MVHR filters predominantly come in filtration grades ranging from G2 to M5 due to several reasons. Firstly, this range strikes a balance between filtration efficiency and airflow resistance. This ensures that the system operates efficiently without overburdening the ventilation mechanism. Secondly, filters within this grade range are generally more cost-effective compared to higher-grade options like HEPA filters. This makes them an economical choice for maintaining good air quality without incurring exorbitant maintenance costs. Additionally, filters in the G2 to M5 range are easier to maintain and have a longer lifespan, contributing to their popularity. Lastly, these filters are versatile and suitable for various environments, including residential homes, offices and light commercial spaces. You can read more about this topic here.
In Summary…
Choosing the right air filter involves understanding the standards and what contaminants each filter grade can capture. This knowledge ensures optimal air quality and efficiency in various environments.
