As a firefighter of 6 years these two backdraft videos provide in depth information and training purposes that will help firefighters understand and evaluate a backdraft more efficiently. Thank yoy very much!!!
@@Isaacool if i remember correctly flashover is when the heat builds up in a room to the point where all of its contents combust at once(autoignition temp) while backdraft is a smoke explosion caused by the introduction of oxygen
You guys should try filming an ultrasonic vaporizer. I'd love to see how the broken capillary wave forms at the surface of the water, and at what point the vapor begins to be produced. Great video as always!
It would look pretty cool but i think they'd have to use some sort of high mag macro lens to actually see it since it happens on an almost molecular scale.
Hi ! Great video. I was surprised you guys didn't ask about the procedure they use to "disarm" a potential backdraft situation. I think they do something like punch a hole in the roof to control a potential backdraft.
It always depends on the situation. No FD has a standard playbook for every imaginable scenario that they just implement from A to Z. Forced Ventilation is a whole set of lessons in itself. You can place fans in front of the entrance to push smoke out. While this extremely effective (you can go from zero visibility to almost smoke free in less than a minute) it should never be done if either the building layout is unknown or the roof itself is on fire. In other cases, opening the roof is an option that can be considered. If the building’s layout is unclear, ventilation through fans might push very hot smoke into areas you don’t want it to be in. A fire on the ground floor can also quickly jump up several storeys if flames come out a window. Hot gases accumulate under the outer roof overhang, crawl inside between the insulation and the rafters, and boom, you now have the attic on fire. Opening the roof is only done in coordination with a crew on the inside. Because you don’t want the roof to collapse with people inside the building and have flaming debris rain on the people around.
One thing to note when Dan is pulling the lid of the BBQ off. He's pulling it "towards" himself to use the lid as a type of shield. Most people who get injured by this type of backdraft is tipping the lid to the right or left and they are looking into the grill. There is no projection/shield between them and the re-igniting fire. So the fire ball engulfs them and they end up looking like Dan at the closing scene, best case ending. Or they end up on their way to the hospital. ALWAYS open a grill top with the top between you and the grill if at all possible if it even remotely looks like it's just smoking and the flames went out. Better safe than looking like Dan.
Pretty sure you saw when he put the chicken down the fire was close to his arm, however it would've helped on the other hand for safety reasons and fashion reasons it wasn't too needed
My job is about promoting fire safety. We do live demonstrations of oil fires. If you ever get an oil fire, cover it to stifle the oxygen, turn off the heat, then *do nothing else* except for calling the fire brigade. The biggest mistake people make is taking the lid or cover off too soon. Never try moving it. Oh, and never put water on an oil fire. (Incidentally, that might make an interesting slow mo video).
"It was our honor" he says. The hero whose job is dreamt by kids and adults alike and risks his life for strangers says "it was our honor". What a legend. Anyway, awesome episode as usual! Gotta admit the image for the BBQ backdraft was more beautiful than the big one haha The eyebrows gag was funny! Astounding how different a person looks without those.
So no one really explained it completely, but without oxygen, combustion cannot occur, so instead pyrolysis happens. Pyrolysis is the incomplete burning of the fuel into simple carbon molecules and hydrocarbons/tars. That's what the smoke is. In complete combustion, the smoke is CO2 and ash - minerals like potassium hydroxide. That kind of smoke cannot set on fire. So basically the heat without oxygen evaporates the fuel into a gas, which looks like smoke, but can combust upon introduction of oxygen and heat (fireball starts where air meets heat source)
If anyone is looking for more information about this specifically I think it is called wood gas and can be made, filtered, and even power a combustion engine
One very similar occurrence going through as a line cook was the fryer, the ignition to start wasn't working properly, so we have a lot of gas seeping through. Then it ignights randomly causing 2 feet of rushed flame shooting out like a boom, then back to normal
That's actually what makes things like that so especially dangerous. In real time, it doesn't look so terrible so you don't think too much of it. But if a fireball like that hits anything flammable on you, you're gonna have a bad day... Can happen faster than you can even see.
Nope. If you go back to some of their really old videos when gavin had some mental hair, there's a bunch of comments saying the same thing from like 6+ years ago. 😊
@@blipboop5594 You realize that just because something is trying to make its creator money doesn't automatically make it bad right? Profit ain't a dirty word
@@blipboop5594 Wins prize for most inane comment ever. Even thought there is undoubtedly scripting, which provides structure by the way, their friendship and camaraderie very regularly becomes evident even during each scripted phase. They clearly crack little "Gav and Dan" jokes here and there off script. I love it.
@@trod146 It's kind of a joke. Like you can't really get a record for filming anything faster cuz you know.... Light..... Unless they ment just film a world record? In that case they have as well, like the record winning fastest shooter guy.
I think many people should be in this Situation from the intro. Just to realize how happy they could be to have (voluntary) fire fighters. For context: I'm a voluntary fire fighter in Germany and sometimes we are confronted with people, who think its funny to stop us from working or standing right in front of us and taking pictures while making it impossible for us to help someone. So, for everyone, who do things like that, i hope you have one thing in Mind: We risc our lives for you
I’m taking classes right now to become a firefighter and I showed my teacher this video and he just said always be careful when the conditions are right for a backdraft to occur.
He's wrong. Always be careful, no matter what you think, the conditions are. And practise with a selectflow nozzle (or whatever you use to generate a fog pattern).
I'm glad Travis County Fire Rescue do these mock ups so that it helps the fire fighters learn how to handle it in a controlled (relatively safe) environment. I hope other areas' fire departments do the same even if they wouldn't agree to do it for you to film... Everytime I come across someone in uniform when I'm at the store I go thank them for their service because not many are willing and/or capable of having the bravery to run towards a fire to help instead of run away. I sincerely believe every country should have a First Responders Appreciation Week.
@@mico6155 overheated doesn't mean the components melted, it just means that the camera turned off in time before it would destroy itself. If your computer goes about 110 celsius it will "overheat" and turn off, but it won't be destroyed.
Ive never said it, but this Channel is Insanely Good, ive been here since the big water balloon and the quality is lit, you guys are amazing thanks for all these hours of slow mo clips! I love what your doing! Continue on!
that is the most awesome recording of flames ive ever seen. would be really cool to see super slow motion of just different types of fires, like wood fires, liquid fuel fires, small, big, underwater. etc. just to see how the patterns and speeds change within the flames.
They thought it was hot in those fire suits in winter. Imagine what it was like for the guys in Australia fighting a bush fire with an ambient temperature of 50°C!
bas van der werff the ambient temperature does make it feel worse though when you can’t cool off easy even after moving away-but the other commenter is correct-bushfire year is far lighter for exactly this reason.
Oddly the little grill backdraft looks way more impressive than the shipping container's. Probably has to do with the ratio of size between the flame/explosion and the thing it comes out of.
I have a feeling it's a little to do with the aperture that the oxygen is going in/flames coming out from. In that the size, possibly even shape, affect the end result. The idea being that the grill is a larger circular and more squashed shape so therefore more oxygen gets into contact with more of the embers quicker; whereas the container is long and the opening for the oxygen was much smaller in comparison to the grill (thus making the oxygen take longer to reach the back of the container), relatively speaking, and provided more of a forward force rather than the more omni-directional one the former accommodates.
Please do more slow motion fire blasts!!! After watching that ending scene in London Has Fallen, I became hooked onto slo mo fire blasts with calm music.
Watching the smoke move back into the fire due to the oxygen rushing back in looks cool (only in slow mo and only in this video). Found that really fascinating that you can see it rushing back.
Well what can they do? They ran out of ideas ages ago and everything is just a slightly different version of something they already did, or literally just something already done but they do it bigger.
Suggestion for a video: After watching Nighthawkinlight video called " Electromagnetic force fields vs magnetic cannonball" , I was wondering if you used your super high speed cameras if you could catch any slow down of a projectile, be it copper passing by strong magnets or a magnetic ball past thick copper plates or tube? He could not detect any slow down but was not using a super fast camera.
OMFG the end :D your video reminded me how i was starting a fire with gasoline. the vapor ignited into a nice circle spreading fast arounf the fire :) very nice, try it out :)
