Summary

nCoV is coming! But masks are running out!

Using a snorkeling mask, covered a small piece of mask on fan, ONE mask can be divided into 4-6 pieces.

--2020 Feb 3 15:00 UTC +8

The breathing resistance is still a bit large at the moment, I can't measure the resistance. But wearing it I can barely complete 40 squats.

--2020 Feb 9 00:30 UTC+8
12v runoff Fan = NMB 5020 BM5020-04W-B49 ( https://item.taobao.com/item.htm?id=553042177755 )
Power = 5v power bank + 5v-to-12v adapter ( https://detail.tmall.com/item.htm?id=526012870694 )

it even works for N95.

working in progress.

!!! I CANNOT prove the safety of this. !!!
AT your own risk.