D15TM Filter Face Mask

This mask is fitted with a Brits Nonwoven D15TM Filter

Together with hand-washing, good sanitation and social distancing, the wearing of a suitable mask is a valuable weapon in the arsenal of the war against the virus. The mask should always be used in conjunction with all the other recommended protocols for COVID-19.

The current challenge

Many people do not know that they have COVID-19, and unknowingly spread the virus through direct and indirect contact. The infection is mostly spread through airborne droplets which contain the virus, produced through talking, coughing or sneezing. These micro droplets then deposit on nearby surfaces, items and other people.

Scientists have measured a pressure level of 6000 Pa in the windpipe of a person who sneezes. These droplets can travel up to 2 metres and land on the faces of people nearby, and can even be inhaled into their lungs.

In order to significantly reduce the virus’s ability to spread, it is important that we protect each other. If I wear a mask, I protect you; to protect me in return, you must please wear a mask too.

The World Health Organisation confirms this in their published bulletins. The following is from the WHO website, updated 29th March 2020:

Click Here To Read Article

Modes of transmission of the COVID-19 virus

Respiratory infections can be transmitted through droplets of different sizes: when the droplet particles are >5-10μm in diameter, they are referred to as respiratory droplets, and when then are <5μm in diameter, they are referred to as droplet nuclei. According to current evidence, the COVID-19 virus is primarily transmitted between people through respiratory droplets and contact routes. In an analysis of 75 465 COVID-19 cases in China, airborne transmission was not reported.

This information is absolutely critical. What it tells us is that the primary mode of infection for the general population is via droplets. The droplets are greater than 5 microns in size, and are generated by talking, coughing and sneezing.

The airborne state of the virus smaller than 5μm mainly occurs in hospitals, where they have specialised masks to take care of the virus in nuclei or aerosol form.

The risk that you and I face, therefore, is micro droplets of 5μm or larger.

A key to reducing the rate of infection is to disrupt the transport system for the virus. One of the most effective ways we can do this is by controlling and managing the droplets which are the key mechanisms for virus transport.

The filter system for masks that we have created is designed to do exactly that, trapping any particle that is 5µm and above. The mask actually entraps many smaller particles as well, but the real holdout is 95% effective above 5µm.

As there are no standard specifications for face masks for the general population, Brits Nonwoven cooperated with leading local university to develop an interim minimum requirement that would be suitable for COVID-19 masks to be worn by anyone other than medical personnel. This mask specification and test regime was therefore designed for the public. As the main threat is a respiratory particle which has a known size distribution, the method of testing agreed upon was ISO 14644-1. The reasoning for this was that all hospital cleanrooms and theatres are currently tested for air quality using this method. This method determines the particle sizes that the filter element will entrap, and the particle sizes that will pass through.

D15TM Filter Specifications

How to Use the D15 TM Filter Face Mask

Wearing a D15TM Filter Face Mask is not a primary preventative measure and should not provide a false sense of protection that leads to a misuse of masks. The mask should always be used in conjunction with WHO COVID-19 protocols for infection prevention.

Always use a new or disinfected D15TM Filter Face Mask or Filter Element. See washing and disinfecting instructions below.

  1. Take your D15TM Filter Face Mask out of the packaging and disinfect as per the instructions.
  2. Wash your hands with alcohol-based hand rub or soap and water.

  1. Pick up your mask by touching the elastic bands only; avoid touching the mask itself.
  2. Fit elastic bands around head.

  1. Fit the mask around your mouth, nose and chin, ensuring that there are no gaps.
  2. Adjust by touching only top or bottom edge of mask.

  1. Your mask should be completely on or off – do not wear under your chin.
  2. Never wear your mask inside-out.

  1. Remove your mask if it gets damp or soiled.
  2. Do not touch or adjust your mask while it is on and avoid touching your face.

  1. If you touch your mask, wash your hands immediately with alcohol-based hand rub or soap and water.
  2. Always follow social distancing and good hygiene practices while still wearing your mask.

  1. Hold the elastic bands only and lift the mask from your face.

  1. Hold the elastic bands only and lift the mask from your face.


  1. Place your mask with filter in a bowl and cover with boiling water.
  2. Leave the complete mask in the hot water for at least 5 minutes to disinfect.
  3. Wash your hands using hand-washing protocols for COVID-19.
  4. Wash your face using COVID-19 protocols.
  5. If the mask is dirty, remove the filter and hand-wash the mask, or machine-wash on a gentle cycle.
  6. Do not squeeze, wring or hand-wash the filter, as the delicate structure may be damaged.
  7. Leave the mask and filter to air-dry. When dry, insert the filter back into the mask – it is now ready to wear.
  8. Once the filter has been used and disinfected 7 times, discard after disinfecting and insert a new filter.
  9. If cannot disinfect before disposal treat as hazardous waste.

Click on the icons below to download the Brits Nonwoven D15™ Filter Face Mask data sheet and certificates

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