Filter Grade Classification — CTAPRO Reference

📊 Filter Grade Classification

Complete filter classification from coarse (G1) to ultra-high efficiency (H14), mapped to CTAPRO filter types and international standards.

Grade	Standard	Test Method	Efficiency	Particle Size	CTAPRO Filter
G1	EN779	Gravimetric	<50%	>10 μm	Synthetic/Metallic
G2	EN779	Gravimetric	50–65%	>10 μm	Synthetic/Metallic
G3	EN779	Gravimetric	65–80%	>10 μm	Synthetic/Metallic
G4	EN779	Gravimetric	80–90%	>10 μm	Synthetic/Metallic
M5	EN779	Opacimetric	40–60%	1–10 μm	Soft Bag / Rigid Bag
M6	EN779	Opacimetric	60–80%	1–10 μm	Soft Bag / Rigid Bag
F7	EN779	Opacimetric	80–90%	0.4–1 μm	Soft Bag / Rigid Bag
F8	EN779	Opacimetric	90–95%	0.4–1 μm	Soft Bag / Rigid Bag
F9	EN779	Opacimetric	>95%	0.4–1 μm	Rigid Bag
H10	EN1822	MPPS/DOP	>85%	0.1–0.3 μm	—
H11	EN1822	MPPS/DOP	>95%	0.1–0.3 μm	—
H12	EN1822	MPPS/DOP	>99.5%	0.1–0.3 μm	—
H13	EN1822	MPPS/DOP	>99.95%	0.1–0.3 μm	Absolute (HEPA)
H14	EN1822	MPPS/DOP	>99.995%	0.1–0.3 μm	Absolute (HEPA)

Filter Grades — efficiency spectrum from G1 to H14

ISO 16890 (2016) replaces EN779 with a new classification based on PM sizes:

💡 Tip EN1822 (HEPA grades H10–H14) remains unchanged under the ISO 16890 transition.