There is a large gap around the filter holder! (2014 design)

Some user feedback that the filter holder of the 2014 new design is not as tightly seal as the old design. There is a large gap around the filter holder and the filter inside is clearly exposed. (pic. 1)

Does this gap cause a problem with the seal?

Does this gap cause a problem with the seal?


First the large gap around the filter holder is our design intent. It is designed to allow more air to go through the filter. More air opening means lower resistance and easier breathing. This is an important benefit relates to the comfort of mask wearing.
Now, does this large gap also indicates the new 2014 model is less protective?
Certainly NOT. To understand, you need to check the inside of the mask (pic. 2) Here you can see clearly, all the air has to go through the opening. The seal is valid, as long as the filter makes good contact with the edge of the opening.

The seal is good , as long as the inside of the filter is properly fitted.

The seal is good , as long as the inside of the filter is properly fitted.



To demonstrate the above is true, we use a TSI PortaCount device to perform a fit test of a user using the 2014 new design. The overall fit-factor in this case is 165, clearly above the pass rating of 100.

Fit test result from one of the 2014 design users.

Fit test result from one of the 2014 design users.

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