Chinese MF14 Gas Mask review

Review of the Chinese MF14 Gas Mask/Respirator which is relatively cheap on Aliexpress and similar sellers.
This is primarily a Chinese industrial mask but has turned up in military use.
The more modern versions of the mask like the one in the video are in 40mm STANAG/NATO/RD40 rather than GOST like the older versions meaning they are ideal as a cheap mask that can be used in a Western country with an easy supply of safe 40mm filters.