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In a Non-Rescue Fire Call this tool can be used to cool a Fire charged room to help prevent a flashover from the exterior of a structure to prevent risking the life of a Fire Fighter. Multiple tools can be used in tandem to multiply the results.
Steep Roof Gable Cut
For Fire calls requireing attic ventilation for steep roof structures, this tool can be used in combination with a gable cut in the side wall just below the peak of the roof. Making it safer for fire fighters in thier ventilation operations.
Ground or Aerial Ladder
When attached atop a ladder this tool can be used on floors above the first floor. By way of preconnected hose gives the fire fighter the ability to control the tool from the ground at 100psi to turn it on or off. Settings of the tool will be pre adjusted depending on the fire call situation before raised into the window.
If the Main Source of the Fire is on the first floor of a structure you can use this tool by itself with out a ladder to perform its funtions. With The tool locked in the 90 degree positon so it can penetrate a window at the seat of a fire.
The Officer of the first arriving fire engine, after confirming that all humans are out of the burning structure, by a "360" (complete) evaluation of the scene, decides which room(s) are involved with the seat (point of origin) of the fire, to help reduce dangers to his or her crew, orders that the Grantham Mechanical Ventilator to be used.
The defensive tool is then secured to the top of a ladder with the hose-line connected to the device's water input and positioned through the opening into the burning structure so that the sprayer circuit input is outside the structure and fog sprayer output nozzle is inside the structure pointing outward. If the attic compartment is the only area needing emergency ventilation, then the attic vent must be cut out and enlarged to allow fog pattern effectiveness.
A firefighter then climbs the ladder and clears the remaining glass and debris with a pike pole with the firefighter on the ground heeling the ladder and signaling to the pump operator to charge the line (turn on the water).
Water flow is then adjusted on the device by the firefighter at the top of ladder, first activating 5 to 10 seconds of flow from the sprinkler head if needed if needed for suppression purposes.
The firefighter then activates and adjusts the flow from the ventilation fog nozzle.
Once configured, the device requires no further attention, unless the ladder is needed for emergency escape from the room, then a firefighter on the ground can adjust the ladder to a 45 degree angle (if possible) and then heel the ladder to steady it while the firefighter at risk makes his or her escape by descending the ladder.
Note that the instant invention is not limited to applying water spray and fog to suppress a fire, but may also give the firefighter the ability to remotely control the application of foam or other fire suppression materials as well.
How it works:
In essence, the cool water fog stream pulls the heat and smoke from the burning compartment in a manner akin the way one racing car "drafts" another, with the front car creating a partial vacuum which in effect pulls the following car along.
In this case, the fog stream is analogous to the lead car and the hot air/smoke mixture is the following car.
In addition, the fog, being much cooler than the heated air in the compartment and in a high state of division as tiny droplets, presents a highly effective heat sink into which the heat flows due to basic thermodynamic principals.
As one skilled in the art of firefighting knows, flashover is the most dangerous time of a fire. When the room bursts into flame, flashover has occurred. Flashover is caused by the radiation feedback of heat. Heat from the growing fire is absorbed into the upper walls and contents of the room, heating up the combustible gases and furnishings to their auto-ignition temperature. This buildup of heat in the room triggers flashover, which signals: (1) the end of an effective search and rescue in a room; (2) the imminent death of any person, civilian or firefighter, trapped in the blazing room; (3) the end of being able to use a portable fire extinguisher, instead requiring an attack hose-line; (4) the end of the fire's growth stage and that the fire is in the second stage of combustion - the fully developed stage; and finally, (5) the change from a contents fire to a structure fire.
Flashover is not time-dependent. Some flashovers can occur within three minutes from ignition; others may take considerably longer. Flashover times are more dependent on the size of the compartment, the fuel load within the compartment, and the construction of the compartment. Again, these variables cannot be seen from outside the structure, so the interior firefighters and officers have to be constantly aware of them.
Flashover signals the beginning of the structural collapse danger. When operating at a fire, firefighters want to delay flashover inside a burning room. By delaying flashover you can "buy" several minutes which may be critical. The first tactic that can delay a flashover is to ventilate the compartment. This allows heat and heated gases to escape from the compartment, replacing them with cooler air. Ventilation serves to delay flashover when done quickly and effectively.
The second tactic that can delay a flashover is to close off the compartment. By closing a door in the room that is experiencing pre-flashover conditions, air cannot enter as readily. This can decrease the rate of burning in the room, delaying the flashover. By closing a door, you are also taking the imminent flashover out of the surrounding area so that other nearby rooms can be searched in a safer manner for a longer time.
The final way that a flashover can be delayed is by cooling the atmosphere with water, high in the compartment. This would have to be done with a hose-line or water-based fire extinguisher. By aiming the stream of water into the high heat layer, the gases are cooled. This reduction in temperature slows the process of flashover within the compartment. This technique has the disadvantages of causing an increase in steam buildup that can hinder advancing crews, as well as the loss of any visibility that may have been remaining.
The indications of a potential flashover may include a growth stage fire that produces thick and dark smoke, high heat buildup, and rollover. A growth stage fire must exist, even though it may be partially or completely obscured by walls, furniture, and thick smoke. This is the only way the heat needed to flash over can be produced within a compartment. Thick and dark smoke indicates the fuels that are present are giving off vapors that can burn when exposed to high heat. The heat is intense and can build up quickly.
May be cheaper for the home owner, but increases the possibility of a collapse.
Obvious increased possiblity of a structure collapse.