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EN 14387:2021

Respiratory protective devices – Gas filter(s) and combined filter(s)

EN 14387:2021 supersedes EN 14387:2004+A1:2008.

EN 14387 refers to gas filters and combined filters for use as replaceable components in unassisted respiratory protective devices (RPD) with the exception of escape devices. Filters for use against CO are excluded from this standard. Laboratory tests are included for the assessment of compliance with the requirements. Some filters complying with this standard can also be suitable for use with assisted respiratory protective devices and/or escape devices. If so they need to be tested and marked in accordance with the appropriate European Standard.

In short, the EN 14387 standard covers gas filters and combined filters used as components of unsupported respiratory protective equipment. The main goal of the respiratory protection program is to prevent exposure to air contaminated with harmful dusts, mists, fumes, gases, vapors or sprays. This is important above all in terms of preventing occupational diseases.

Filters are marked, according to their scope, through letters and colors indicating their type and through numbers indicating their class. The combined filters are marked in accordance with gas and particle information.

Filter type Color Main scope/ protection against
AX Brown Against organic compounds with a boiling point below 65°C (low 


A Brown Against organic compounds with a boiling point above 65°C
B Grey Against inorganic gases and vapors such as chlorine, hydrogen 

sulphide, hydrocyanic acid, hydrochloric acid

E Yellow Sulphur dioxide, hydrochloric acid
K Green Ammonia
CO Black Carbon monoxide
Hg Red Mercury vapors
NO Blue Nitrous gases, including nitrogen monoxide
Reaktor Orange Radioactive iodine including radioactive methyl iodide
P White Against dusts and aerosols
SX Purple Against special gases and vapors


Each one of these class types is further classified in three further classes relating to filter absorption capacity. These classes are:

Class 1 (Low Capacity) Suitable for pollutant concentration of < 0.1%, or up to 1000ppm.

Class 2 (Average/Medium Capacity) Suitable for pollutant concentration of < 0.5%, or up to 5000ppm.

Class 3 (High Capacity)Suitable for pollutant concentration of < 1%, or up to 10,000 ppm.

Gas and combination filters will often feature additional markings for specialized standards. These include:

R (= reusable), or NR (= not reusable /single shift)

EN342:2017 Certified Products

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