The OP is looking for something to protect against CO, not just particulates & vapors.
Saw this in the Sporty's Pilot catalog:
http://www.plus15filter.com/ ~$100+
Appears similar to the Evac-U8.
More options from the same manufacturer:
http://www.smokehoods.com/products/
_________________________
- Tom S.
"Never trust and engineer who doesn't carry a pocketknife."