Les Ruble is a 28-year fire service veteran and a battalion chief with Plano (TX) Fire-Rescue. He began his career as a firefighter in the United States Air Force.

Going back to the beginning when we first started our fire service training as “probies,” we were taught the fire triangle, which eventually evolved into the fire tetrahedron.

When we first started our fire service training as rookies, we were taught the fire triangle—fuel, oxygen and heat—which eventually evolved into the fire tetrahedron with the addition of the ...

Obvious differences exist between the fire triangle/tetrahedron models and the negligence triangle/tetrahedron models—for example, the fact that the negligence tetrahedron is not built by simply ...

Historically, physicists created a graphical representation detailing the three elements of fire (fire triangle). In recent years, one more point has been added, creating the fire tetrahedron.

The fire extinguisher class explains the classic fire triangle or tetrahedron, common-sense responses to fire scenarios, the use and capabilities of the different kinds of extinguishers, and hands-on ...