N95-Masks are simply mask having a filtration layer with N-95 filtration specification they can be single and multi-layered but as these masks are used for pollution protection and extremely low biol...

N95-Masks are simply mask having a filtration layer with N-95 filtration specification they can be single and multi-layered but as these masks are used for pollution protection and extremely low biological contamination protection mask, they usually have at least 3 layers. One class of face mask is used for medical purposes, this class includes various mask ranging from surgical masks to biological contamination protection masks. This report focuses on one such mask which belongs to particulate respirator type mask and sub-class of 4-Layered N-95 Mask with Exhalation Valve for low biological contamination..