It's great to protect your lungs but your eyes are are perfect portal for the vapors as well! I use a full face mask with organic acid air filters.
Here is a link on Amazon:
Mask:
http://www.amazon.com/dp/B007JZ1LG6/...439734079&sr=0

Air filters:
http://www.amazon.com/3M-Organic-Car...CPHTX6KPVZDKXP

Yes, they are more expensive than just a standard respirator but I value my eyes more than the extra $125.

I bought my vaporizer last year from SNL. Works great! Tho' it's been a hard year for me to work my bees and maintain our blog having had rotator cuff surgery, the LOML just helped me do our first 2015 OAV treatment this week. Lots -o- dead mites!

Here is a post I made last year after the first round of OAV treatments if you are interested. It's post 104...

https://www.beesource.com/forums/show...il-today/page6

Cheers,
John