Bayonet connection
This connection is very intuitive, allowing fast and secure attachment to the mask. It has a locking mechanism that allows the user to know whether the filter has been positioned correctly.

Activated carbon
The quality of activated carbon used by BLS for gas and vapour filtration meets high safety standards and guarantees excellent filtration performance. They are produced without using toxic additives such as Hexavalent Chromium (Cr VI) and are food grade certified (REGVE231/2017).

Tested against formaldehyde
BLS performed specific NIOSH tests in an accredited laboratory to verify the penetration of formaldehyde into its carbons used for ABEK and ABE filters.

Colour codes
◉ A Organic gases and vapours with boiling points > 65 °C
◉ AX Organic gases and vapours with boiling point ≤ 65 °C
◉ B Inorganic gases and vapours (e.g. chlorine, hydrogen sulphide, hydrogen cyanide)
◉ E Acidic gases and vapours (e.g. sulphur dioxide, hydrochloric acid)
◉ K Ammonia and derivatives
◉ Hg Mercury vapours
P Particles, mists, fumes

Compatible with

• BLS 4000next half-masks
• BLS 5000 b-lock full masks (5600, 5700)

Notes

⁽¹⁾ these filters cannot be used with half-masks because their weight is greater than 300 g
⁽²⁾ these filters are tested against hydrofluoric acid
⁽³⁾ these filters are tested against formaldehyde
⁽⁴⁾ dust prefilters fitted on 211, 213, 214, 243, 244