ISO 16890-2:2022 一般換気用エアフィルター — Part 2: 分数効率と通気抵抗の測定 | ページ 6

3.1.1

空気流量

単位時間あたりにフィルターを通過する空気の量

[出典:ISO 29464:2017, 3.1.24]

3.1.2

気流に対する抵抗

特に フィルタ要素（3.2.2） 全体で測定した場合の、指定された条件での気流システム内の 2 点間の絶対（静）圧の差

[出典:ISO 29464:2017, 3.1.36, 変更 — 「指定された条件で、特にフィルター要素全体で測定した場合 (3.2.2)」が追加されました。]

3.2.1

test device

filter element (3.2.2) being subjected to performance testing

[SOURCE:ISO 29464:2017, 3.1.38]

3.2.2

filter element

structure made of the filtering material, its supports and its interfaces with the filter housing

[SOURCE:ISO 29464:2017, 3.2.77]

3.2.3

upstream

U/S

area or region from which fluid flows as it enters the test device (3.2.1)

[SOURCE:ISO 29464:2017, 3.1.39]

3.2.4

downstream

D/S

area or region into which fluid flows on leaving the test device (3.2.1)

[SOURCE:ISO 29464:2017, 3.1.11]

3.3.1

liquid phase aerosol

liquid particles suspended in a gas

[SOURCE:ISO 29464:2017, 3.2.2]

3.3.2

solid phase aerosol

solid particles suspended in a gas

[SOURCE:ISO 29464:2017, 3.2.8]

3.3.3

reference aerosol

defined approved aerosol for test measurement within a specific size range

[SOURCE:ISO 29464:2017, 3.2.7]

3.4.1

particle counter

device for detecting and counting numbers of discrete airborne particles present in a sample of air

[SOURCE:ISO 29464:2017, 3.2.114]

3.4.2

optical particle counter

OPC

particle counter (3.4.1) which functions by illuminating airborne particles in a sample flow of air, converting the scattered light impulses to electrical impulse data capable of analysis to provide data on the number of particles in multiple size intervals

Note 1 to entry: See ISO 21501-1.

[SOURCE:ISO 29464:2017, 3.2.119, modified — “particle population and size distribution” has been replaced for clarity with “the number of particles in multiple size intervals”.]

3.4.3

sampling air flow

volumetric flow rate through the instrument

3.4.4

particle size

p

geometric diameter (equivalent spherical, optical or aerodynamic, depending on context) of the particles of an aerosol

[SOURCE:ISO 29464:2017, 3.2.133]

3.4.5

particle size distribution

presentation, in the form of tables, numbers or graphs, of the experimental results obtained using a method or an apparatus capable of measuring the equivalent diameter of particles in a sample or capable of giving the proportion of particles for which the equivalent diameter lies between defined limits

[SOURCE:ISO 29464:2017, 3.2.135]

3.4.6

isokinetic sampling

technique for air sampling such that the probe inlet air velocity is the same as the velocity of the air surrounding the sampling point

[SOURCE:ISO 29464:2017, 3.2.105]

3.5.1

efficiency

fraction or percentage of a challenge contaminant that is removed by a test device (3.2.1)

[SOURCE:ISO 29464:2017, 3.1.12]

3.5.2

fractional efficiency

ability of an air cleaning device to remove particles of a specific size or size range

Note 1 to entry: The efficiency plotted as a function of particle size gives the particle size efficiency spectrum.

[SOURCE:ISO 29464:2017, 3.2.59]

3.5.3

penetration

P

ratio of contaminant concentration downstream (3.2.4) of the test device to the upstream (3.2.3) (challenge) concentration

Note 1 to entry: Penetration is sometimes expressed as a percentage.

Note 2 to entry: Penetration is related to efficiency (E) by the expression: E = (1 – P) × 100 %.

[SOURCE:ISO 29464:2017, 3.1.34]

3.5.4

correlation ratio

R

calculation of any potential bias between the upstream (3.2.3) and downstream (3.2.4) sampling systems

[SOURCE:ISO 29464:2017, 3.2.33]

3.6.1

HEPA filter

filters with performance complying with requirements of filter class ISO 35 H to ISO 45 H as per ISO 29463-1

Note 1 to entry: Reference particle filters are laboratory tested for removal efficiency by particle size and/or resistance to air flow.

[SOURCE:ISO 29464:2017, 3.2.84]

3.6.2

reference filter

primary device possessing accurately known parameters used as a standard for calibrating secondary devices

[SOURCE:ISO 29464:2017, 3.1.35, modified — Note 1 to entry has been deleted.]