Why you shouldn’t wear a face mask with a valve


Face coverings are now mandatory in many places across the UK with the latest measures making it compulsory to don a mask in shops, hospitals, some leisure venues and public transport in England.

Similar rules are in place for Wales, Scotland and Northern Ireland.

But while the rules state that a covering just has to be something that masks your mouth and nose and wraps around the side of your face – experts have issued a warning over one particular type.

There have already been warnings that to be effective masks should be at least two – and possibly three layers thick.

Now the Centres for Disease Control and Prevention have urged people to avoid masks with valves, reports The Mirror.

It explained: “The purpose of masks is to keep respiratory droplets from reaching others to aid with source control.

“However, masks with one-way valves or vents allow air to be exhaled through a hole in the material, which can result in expelled respiratory droplets that can reach others.

“This type of mask does not prevent the person wearing the mask from transmitting COVID-19 to others.

“Therefore, CDC does not recommend using masks for source control if they have an exhalation valve or vent.”

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