Just one word of caution the n95 is for bacteria it is a .3 microns mask and a virus will go right through it. Most viruses are around .003 microns in size. The only hope an n95 has of filtering anything is if it is stuck to a spit globule.

I found a filter that should against guard aviruses. It is called a Nanomaks and is deactivates the virus as it passes through the filter with a 99% efficiency.. It looks like it is ten bucks for the mask and a buck a piece for the filter.

For what it is worth.

Home page:

http://www.emergencyfiltration.com/