What is the resistance standard for high-efficiency air filters?

The resistance of high-efficiency air filters is divided into initial resistance (new filter) and final resistance (replacement threshold). In accordance with national standard GB/T 13554-2020 and industry practices, the standards are as follows (Unit: Pa, under rated air volume):

Initial Resistance (Brand New/Clean State)

H10～H12 (Sub-high efficiency / Ordinary high efficiency): 150～200 Pa

H13: ≤250 Pa (National standard mandatory requirement)

H14: ≤280 Pa (National standard mandatory requirement)

Separated HEPA: 200～300 Pa

Mini-pleat HEPA (Common for FFU): 120～180 Pa

On-site Quick Judgment

Replace immediately when the differential pressure gauge reading reaches 2 times the initial resistance.

Replace when air volume drops below 75% of the rated value.

Replace if fan current rises obviously and operating noise increases, which indicates excessive resistance.

5. Reference for Common Specifications (Rated Air Volume)

610×610×150 (H13): Initial resistance ≈ 220 Pa, Final resistance ≈ 440 Pa

1220×610×150 (H13): Initial resistance ≈ 240 Pa, Final resistance ≈ 480 Pa