ISO 29463-1:2024 空気中の粒子を除去するための高効率フィルターおよびフィルター媒体 — Part 1:分類、性能、試験およびマーキング | ページ 6

3.1

filter medium

material used for separating contaminants from air and characterized by its porous structure

[SOURCE:ISO 29464:2024, 3.1.25]

3.2

filter element

filter

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

[SOURCE:ISO 29464:2024, 3.2.59, modified — “filter” has been added as a preferred term.]

3.3

removal efficiency

efficiency

fraction or percentage of a challenge contaminant that is removed by an air cleaner

[SOURCE:ISO 29464:2024, 3.1.17 modified — “efficiency” has been added as a preferred term.]

3.4

fractional removal efficiency

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 29464:2024, 3.2.134, modified — “fractional efficiency” has been added as a preferred term.]

3.5

particle diameter

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

Note 1 to entry: Particle diameter is often referred to simply as “particle size”.

[SOURCE:ISO 29464:2024, 3.2.106, modified — “mean” has been added to the definition.]

3.6

integral removal efficiency

overall efficiency

efficiency (3.3) , averaged over the whole superficial face area (3.10) of a filter under given operating conditions

[SOURCE:ISO 29464:2024, 3.2.136, modified — “removal” has been removed from the preferred term “overall removal efficiency” and from the definition.]

3.7

local filter removal efficiency

local filter efficiency

efficiency (3.3) at a specific point of a filter element (3.2) under given operating conditions

[SOURCE:ISO 29464:2024, 3.2.137, modified — “local filter efficiency” has been added as a preferred term; “removal” has been removed from the definition.]

3.8

nominal air volume flow rate

air volume flow rate at which the filter element (3.2) is tested as specified by the manufacturer

3.9

filter face area

air cleaner face area

cross-sectional face area of the air cleaner through which air flows into the device

[SOURCE:ISO 29464:2024, 3.1.22]

3.10

superficial face area

cross-sectional area of the filter element (3.2) through which the air flow passes

[SOURCE:ISO 29464:2024, 3.2.48]

3.11

effective filter medium area

area of the filter medium (3.1) contained in the filter element (3.2) through which air passes during operation

Note 1 to entry: This excludes areas covered by sealant, spacers, struts, etc.

Note 2 to entry: Effective filter medium area is expressed in m².

[SOURCE:ISO 29464:2024, 3.1.27]

3.12

medium velocity

nominal filter medium face velocity

volumetric air flow rate divided by the effective filter medium area (3.11) of the filter (3.2)

Note 1 to entry: Filter medium velocity is expressed in m/s (fpm).

Note 2 to entry: In devices where the filter medium surface area has been increased by use of pleats, folds or bags, the filter medium velocity may be much less than the filter face velocity.

[SOURCE:ISO 29464:2024, 3.1.28, modified — “nominal filter medium face velocity” has been added as a preferred term.]

3.13

quasi-monodisperse test aerosol

aerosol, the width of whose distribution function, described by the geometric standard deviation σ_g, is between 1,15 µm and 1,5 µm

[SOURCE:ISO 29464:2024, 3.2.7, modified — “test” has been added to the term.]

3.14

coefficient of variation

cv

standard deviation of a group of measurements divided by the mean

[SOURCE:ISO 29464:2024, 3.2.28]