• BLS Half Face Mask - m/l
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BLS 4000 Next Half Face Mask (Medium / Large)

Product Ref: BLS4000NR

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£16.99 ex. VAT £20.39 inc. VATRRP: £0.00
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Product Description

BLS Face Mask Respirator

BLS 4000 Series Respirator Half Face Mask

Introducing the BLS 4000 Series Respirator Half Face Mask, the ultimate respiratory protection solution for those who require a comfortable yet effective safeguard. This half face mask is expertly designed with the user in mind, providing exceptional comfort and a secure fit. Crafted with premium materials and advanced filtration technology, the BLS 4000 Series Respirator Half Face Mask offers reliable protection against harmful airborne particles, gases, and vapors. Its ergonomic design allows for easy breathing and unrestricted movement, making it ideal for extended wear. Whether you're working in construction, painting, or any other hazardous environment, trust the BLS 4000 Series Respirator Half Face Mask to keep you safe and breathing with ease.

Works with the following mask filters from the BLS range:

3 Dust Particulate Filter

A2 Gas & Vapour Filter

ABEK1 Gas & Vapour Filter

K2 Gas & Vapour


Main Features


  • 25% LIGHTER FACEPIECE - The reduction in the thickness of the oronasal allowed a 25% reduction in the weight of the half mask, which appears to be among the lightest on the market.
  • DROP-OFF SYSTEM - Front mask with quick attachment/release system and sliding elastics, to remove and lower the half mask without removing the head harness.

  • 4000 S = SILICON - Soft and comfortable

  • BAYONET CONNECTION - Highly intuitive with a quick and safe hold on the mask and locking feedback for a better weight distribution on the mask and a wider field of vision. Compatible with BLS 200 series filters.

  • FULL RANGE OF FILTERS - Including P3 pancacke filters and prefilters to be used on gas filters

  • EXCELLENT FIT : top results at fit test

  • EASY AND FAST MAINTENANCE - It can be disassembled in less than a minute making cleaning and maintenance much easier

  • HEAD HARNESS - Thinner and lighter head harness, with quick adjustment, allowing excellent compatibility with other PPE.

  • WIDE ELASTICS: easy to adjust



The half face mask is manufactured from silicone and thermoplastic. Thermoplastic moulds very easily to the shape of the face and is recylable at end of life. Silicone is excellent for users with allergies as it produces very little alergenic reaction.



What Protection Level Do I Need?

This filter level is a 2 which is the second highest defence and a specialised K level. K2 protects against Ammonia and Amine organic by-products.

Filter Protection Color Codes

A Organic gases and vapors with boiling point > 65 ° C
AX Organic gases and vapors with boiling point ≤ 65 ° C
B Inorganic gases and vapors (e.g. chlorine, hydrogen sulphide, hydrogen cyanide)
E Gas and acid vapors (e.g. sulfur dioxide, hydrochloric acid)
K Ammonia and derivatives
◎ P Dust, mists, fumes


  • Bayonet connection - This connection is very intuitive, it allows a quick and secure attachment to the mask. It has a locking mechanism that lets the user know if the filter has been positioned correctly.
  • Activated carbons - The quality of the activated carbons used by BLS for gas and vapor 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 certified food grade (REGVE231/2017).
  • Tested against formaldehyde
  • BLS has carried out specific NIOSH tests in an accredited laboratory to verify the penetration of formaldehyde into its carbons used for ABEK and ABE filters.
  • Filter Canister - Made of non deformable ABS allows to have an absolite control over the compression of the activated carbon grains within, this way air corridors are completely avoided making the filter 100% safe.


About BLS Respirators

BLS is an Italian Headquartered Respirator firm with 3 manufacturing facilities all in the EU. All products are researched and manufactured in the EU ensuring that supply chain disruption is minimised with short delivery lead times.

BLS operate their own innovation, quality and R&D testing with 50 years experience in respirator technology. They are accredited to ISO 9001 certification and EU 2016/425 for quality controls

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