Valve Deactivator


What's Inside the Pack?

The product consists of two adhesive stickers: one large, orange Valve Deactivator, and one small informational label.

How do I attach my Valve Deactivator?

First turn the mask fully inside out. Then peel the large, orange Valve Deactivator off the wax paper and stick over the valve on the inside of your mask. Apply gentle pressure to ensure it has adhered correctly to the valve, but take care not to tear it or break your valve.

Position the informational “valve deactivated” sticker on the outside of the valve where it is visible to others and stick it down securely.


Is it a necessary item?

Although little evidence currently suggests that masks with valves pose greater risks of spreading viruses such as Covid-19 (see updates from the WHO), we are acutely aware of how this unprecedented situation is sparking concern amongst some authorities in our communities. Therefore, we have taken the following proactive steps to ensure our customers can access first-class protection whilst aligning with the regulations of their respective locations.

The mask will still offer the same level of filtration for the user. However, by sealing the valve mechanism, our customers can continue using their Cambridge Mask in areas where local policies regulate the use of face masks with valves. A Cambridge Mask, even with the valve deactivated, provides greater protection than other alternatives to both the user and the wider community.

Independently Tested Filter

  • Certified as child safe under 14 U.S.C 1278a and CFR Parts 1370 1501 1500.53 and 1500.44 (Certified by Bay Area Testing Labs)
  • 99.6% viral filtration efficiency and 99.7% bacterial filtration efficiency (tested by Nelson Labs USA)
  • Particle Filtration Efficiency >98%

The PRO mask uses a unique triple filter system.

The first layer of the filter system catches larger pollution particles such as dust and PM10. It’s then backed up by the Three-Ply Micro Particulate which stops nearly 100% of smaller particulate matter such as PM2.5 and PM0.3.

The inner filtration layer is made from 100% pure activated carbon cloth, originally developed by the UK Ministry of Defence for chemical, biological, and nuclear warfare protection.

The carbon filter is treated with silver to ensure 99% of harmful pathogens are removed and killed.

This multi layered  filter system means the Cambridge Mask performs better and lasts longer than other masks on the market.

    The PRO Mask can be used for up to 340 hours depending on the level of pollution it is exposed to.

    For the average customer this is around 3-6 months of wear. The mask can be washed with soap and hot water, however, keep in mind that this will not extend the life of the filters.

    For all the details of the filter’s lifespan, check out our FAQ page.

    You may also like