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."