L’Organisation Internationale de normalisation (ISO) a créé un nouveau standard global, la norme ISO16890, qui définit la classification et les procédures d’essai des filtres pour l’air utilisés dans des systèmes généraux de ventilation. La norme ISO16890 se réfère notamment aux éléments de filtration de l’air en tenant compte des particules de dimensions comprises entre 0,3 μm et 10 μm (voir le tableau).
Le nouveau standard, qui est entré en vigueur de manière définitive à partir du mois d’août 2018, à remplacé la réglementation Européenne EN 779 et la ASHRAE 52.2, prédominante aux USA, dans le but de créer une seule réglementation mondiale, subdivisée en 4 classes liées aux performances du filtre par rapport à trois tailles de particules différentes avec un pourcentage plus ciblé qui indique l’efficacité du filtre.
Les principales différences entre le standard ISO16890 et les autres normes concernent surtout les essais qui deviendront plus sévères, avec une augmentation consécutive de l’IAQ (qualité intérieure de l’air), et le fait que les poussières plus fines, objet de la classification et la PM1, sont aussi les plus dangereuses pour la santé de l’homme. Des filtres avec des niveaux d’efficacité élevés en mesure de les bloquer contribueront donc à améliorer la qualité de l’air que nous respirons.
Classification:
Group | Class | Reference Value | Final ΔP (Pa) | ||
---|---|---|---|---|---|
ePM1 min | ePM2,5 min | ePM10 | |||
0,3 ≤ x ≤ 1 | 0,3 ≤ x ≤ 2,5 | 0,3 ≤ x ≤ 10 | |||
ISO Coarse | – | – | < 50% | Initial gravimetric arrestance | 200 |
ISO ePM10 | – | – | ≥ 50% | ePM10 | 300 |
ISO ePM2,5 | – | ≥ 50% | – | ePM2,5 | 300 |
ISO ePM1 | ≥ 50% | – | – | ePM1 | 300 |
Comparison EN779 – ISO16890
EN779:2012 | ISO16890 |
---|---|
Compressed air capacity between 0,24 m3/s (850 m3/h) and 1,5 m3/s (5400 m3/h) | Compressed air capacity between 0,25 m3/s (900 m3/h) and 1,5 m3/s (5400 m3/h) |
F9, F8, F7, M6, M5, G4, G3, G2, G1 | ePM1, ePM2,5, ePM10, ISO Coarse are the maximum particle concentrations |
Dp = 0,4 μm | 0,3 μm ≤ Dp ≤ 10 μm |
The minimum efficiency (ME) defines the filtering classes between F7-F9 | The average efficiency (EA) is the average between the initial efficiency (Ei) and the discharged efficiency (Ed) |
Ed from average samples (F7-F9) on liquid isopropanol | Ed from complete filter with isopropanol vapours |
The dust built-up is calculated up to a final pressure of 450 Pa | PM10 < 50% – Δpfinal = 200 Pa PM10 ≥ 50% – Δpfinal = 300 Pa |
Dust: ASHRAE | Dust: ISO A2/Fine AC |
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