July 2017

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Vent Enter Isolate Search

VEIS is a useful tool that can be used to check a room or multiple rooms from the exterior that may be cut off from the interior due to fire conditions or other circumstances. This is an operation that should be considered early when dealing with a known or potential rescue. Performing a VEIS early, especially in a bedroom window, will greatly increase our chances of a victim rescue. The following are statistics from a 2011-2013 study of the leading specific locations of civilian fire fatalities in residential structures to reinforce that fact:

  • 50% - Bedrooms
  • 11% - Common Rooms
  • 8.3% - Bathrooms
  • 7.9% - Kitchen

In preparation for the upcoming night drill, click on the link below to review VEIS tools and operations. Then watch the video of the Colorado Springs FD putting it all together.

VEIS Powerpoint


Firehouse entry: CFR ISO TRNG / ??? / ???


Fire Behavior

The following two videos reinforce some of the fire behavior we've been discussing in relation to flow paths and transitional attack. Both will aid you in your decision making during the night drill operations.

The first video shows a simulated VEIS operation in two second floor bedrooms. The first room has its bedroom door closed, while the other has its door open to the rest of the structure. Notice the difference in how the products of combustion exit the structure based off of whether the window is acting as a unidirectional or bidirectional vent. You can then see how conditions change in the second bedroom when they close the door. This, along with the changes in temperature, show how important it is to immediately close the door and isolate the room upon entry.

The second video shows the effects on temperature and thermal layering from a transitional attack through an upper floor window. An interior view of the area outside the room shows the effects of a proper straight stream to the ceiling of the room versus an incorrect fog pattern, inducing large amounts of air and blocking the exit of smoke and heat. This demonstration helps stress the need for correct pattern and proper technique during a transitional attack, and the effects it can have on victims and interior crews alike.