#technical

Tearing the burnt building apart to find hidden hot spots once the main fire is out.

The moment everything combustible in a room ignites at once.

An explosive reignition when fresh air hits an oxygen-starved, smoke-filled space.

The fast on-scene assessment of what you're dealing with.

An atmosphere that will kill or maim you if you breathe it without SCBA.

Flame rolling across the ceiling as unburnt fire gases ignite overhead.

OSHA rule: two firefighters inside an IDLH fire, two staged outside ready to rescue them.