Common Air-Filter Terms and Relevant Chinese Standards

2023-10-24 13:06:50

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“ Key terms include rated airflow, efficiency, resistance, initial and final resistance, and dust-holding capacity, alongside four relevant Chinese standards. ”

1. Common terms

Rated airflow: The volumetric flow of air passing through an air filter per unit of time under standard air conditions. The commonly used unit is m3/h.

Filtration efficiency: At rated airflow, the air filter's ability to remove particles from the air stream; namely, the ratio of the difference between upstream and downstream particle concentrations to the upstream concentration. The commonly used unit is %.

Resistance: The static-pressure difference before and after an air filter at rated airflow. The commonly used unit is Pa.

Initial resistance: The resistance of an air filter in its clean, untreated initial condition. The commonly used unit is Pa.

Final resistance: At rated airflow, the resistance reached after the air filter captures standard test dust and its resistance rises to the specified value.

Dust-holding capacity: At rated airflow, the total mass of standard test dust captured by an air filter when it reaches its final resistance. The commonly used unit is mg.

2. Relevant Chinese standards

GB/T 14295-2019, Air Filters: Defines and classifies coarse- and medium-efficiency air filters and specifies general requirements and test methods.

GB/T 13554-2020, High-Efficiency Air Filters: Defines and classifies high-efficiency and ultra-high-efficiency air filters and specifies their technical requirements and test methods.

GB/T 6165-2008, Methods for Testing the Performance of High-Efficiency Air Filters - Efficiency and Resistance: Specifies methods and test equipment for measuring the efficiency and resistance of high-efficiency and ultra-high-efficiency filter media and air filters.

JG/T 22-1999, Test Methods for the Performance of Air Filters for General Ventilation: Evaluates the three main characteristics - resistance, efficiency, and dust-holding capacity - of air filters used in ventilation, air-conditioning, and air-purification systems or equipment.

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Common Air-Filter Terms and Relevant Chinese Standards

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