Why does the MITR documentation say "Do Not Use for Escape from Smoke or Fire"?

Q: Why does the MITR documentation say "Do Not Use for Escape from Smoke or Fire"?

A: Fire environments can contain a complex mixture of hazards, examples of which include:

• Carbon monoxide
• Hydrogen cyanide
• Oxygen-deficient atmospheres
• Unknown toxic combustion products

P100 particulate protection alone does not offer protection against such hazards.