Which statement regarding fire travel and point of origin contradicts FDNY procedures?

The statement about larger blister type charring indicating longer burning and hot fires contradicts FDNY procedures because blistering is often caused by the intense heat of a fire but may not accurately reflect the duration or intensity of the fire in every scenario. Blistering can occur quickly, depending on the materials involved and the conditions of the fire. While larger blisters might indicate a hotter fire, they do not definitively point to the length of time the item was exposed to heat or flame. The understanding of fire dynamics emphasizes that many factors can affect charring and blistering, making this assertion misleading in the context of assessing fire behavior and origin.

In contrast, the other statements align with FDNY procedures. The point of origin is typically considered the hottest area, as fire consumes fuel and heat rises, leading to a concentration of heat at that point. Fire patterns, such as the char patterns on surfaces, can indeed reveal the direction of fire spread as they show how the fire interacted with its environment. Similarly, smoke discoloration patterns can provide insights regarding the timeline of the fire by indicating how long materials were burning and the conditions present during combustion.