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Author: Admin | 2025-04-28
Hidden fire and the introduction of a PPV fan can be a deadly combination for interior firefighters Today, most fire trucks are equipped with a positive-pressure ventilation fan. This tool has been in the fire service for quite some time and is used for ventilation tactics at structure fires. We see this fan being used at many fires and with some of them adding fuel to the fire. The PPV fan was developed as a post-fire ventilation tool – meaning that the fire must be completely out before using the fan to ventilate the structure. For it to work, there must be an opening and an exhaust point within the structure. Only two openings can exist at one time for the PPV fan to be effective. The fan works best at removing smoke from a structure one room at a time. By opening a window or a door one at a time, the house can be systematically cleared of smoke. When fire is still burning in voids or in other areas of the structure, and a PPV fan is introduced at the front door or at any other opening, the results are going to be quite noticeable. In the attached video, we see one example of such an incident where hidden fire was still present and the PPV fan made it worse. There are tactics such as positive-pressure attack that can be useful for certain fire conditions within a residential structure fire. But this tactic is not suited for every fire. Rapidly changing conditions When a PPV fan is being used in the wrong fashion, it will change the conditions inside very quickly. What conditions will be experienced? As you will hear from the testimony from the three firefighters who survived this ordeal in the video, you will experience extreme
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