This standard specifies terms and definitions, classification and designation, general requirements, requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of air filters.
This standard is applicable to air filters for ventilation, air conditioning and air purification systems or equipment.
This standard is not applicable to high-efficiency air filters or superior ones.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 1019 General requirements for the package of household and similar electrical appliances
GB/T 1236 Industrial fans - Performance testing using standardized airways
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB 4706.1 Household and similar electrical appliances - Safety- Part 1: General Requirements
GB 8624 Classification for burning behavior of building materials and products
GB/T 18204.2 Examination methods for public places - Part 2: Chemical pollutants
GB 50243 Code of acceptance for construction quality of ventilation and air conditioning works
JG/T 404 Air filter media
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
air filter
the equipment for removing particulate matters (PMs) in the air by filtration, adhesion, charge trapping, etc.
3.2
electric air filter
a type of air filter for removing the PMs in the air by using dust collection plate to trap the PMs which have been charged by applying high-voltage electrostatic field
3.3
rated air flow
the volume flow of air passing through the air filter in nominal unit time under standard air condition
3.4
face velocity
the ratio of the volume flow rate of air passing through the air filter vertically to the area of the section for ventilation
3.5
initial resistance
the static pressure loss of air filter operating at rated air flow in initial state
3.6
final resistance
a specified static pressure loss value reached by the air filter after increasing due to collection of standard test dust at rated air flow
3.7
particle size
geometrical diameter of PMs measured by optical or aerodynamic equivalent methods
3.8
efficiency
the capacity of air filter for removing PMs in the circulating air at rated air flow, i.e. the ratio of the concentration difference between PMs at the upwind side and downwind side to the concentration of PMs at the upwind side
3.9
counting efficiency
the efficiency of the air filter to remove PMs with particular optical particle size or particle size range in the circulating air at rated air flow
3.10
arrestance efficiency
the efficiency of air filter to remove the standard test dust in circulating air at rated air flow in mass
3.11
cleaning efficiency for PMx
the efficiency of air filter to remove the PMs with aerodynamic equivalent particle size less than or equal to x μm in the circulating air at rated air flow in mass
3.12
dust holding capacity
the total mass of standard test dust collected where the air filter reaches final resistance at rated air flow
3.13
rated power
the input power of electric air filter working at rated air flow in initial state
3.14
working voltage
the ionization voltage and the dust collection voltage of the electric air filter during working in the initial state
4 Classification and designation
4.1 Classification
4.1.1 According to the efficiency level, air filters can be classified into low efficiency filter, medium efficiency filter, high-medium efficiency filter and sub-high efficiency filter, coded as C, Z, GZ and YG respectively. Among them, the low efficiency filters can be classified into low efficiency 1 ones, low efficiency 2 ones, low efficiency 3 ones and low efficiency 4 ones, coded as C1, C2, C3 and C4 respectively. The medium efficiency filters can be classified into medium efficiency 1 ones, medium efficiency 2 ones and medium efficiency 3 ones, coded as Z1, Z2 and Z3 respectively.
4.1.2 According to the structure type, air filters can be classified into flat-plate type, bag type, pleated type, moving curtain type, cartridge type, pole plate type and honeycomb type, coded as PB, DS, ZZ, JR, TS, JB and FC respectively.
GB/T 14295-2019 The following standards are cited：
