[KennyBlanken]

They are being really smug, talking about designs and systems that mean nothing when you've got temperatures outside the building hot enough to melt aluminum engine blocks, infrared radiation intense enough to set fire to things hundreds of feet away - as well as very low oxygen and very high CO/CO2 levels along with dozens of different toxic gasses - all of which HEPA filtration won't do squat about.

A "stone facade" doesn't stop +1200 degree temperatures, especially when everything on the outside will undergo incredible thermal expansion and at the least open up gaps. Steel expands about 1-2% for just an increase to 100 degrees C. 300C means about 3-4% expansion. And then there's the huge expanses of windows which will shatter or pop out - and even if they don't, the intense IR radiation will by and large go through them.

People don't realize just how insanely hot wildfires get. Go look at the pictures of neighborhoods that have burnt- they're leveled with the exception of some chimneys, steel girders for houses that have them (most these days don't, builders have been using wood-composite beams) iron fences, car bodies. Everything else is burned or melted.

There isn't a building in the world that will stop the megawatts of heat energy per square meter wildfires can generate in IR radiation.

[jjulius]

>They are being really smug...

Just out of sheer curiosity, I would be tremendously curious to understand what kind of personal/professional background/experience you have that would qualify you to certify their emergency systems as functionally ineffective and their messaging "smug".

[hn_throwaway_99]

Yes, wildfires get incredibly hot. But the fires essentially always travel by embers or direct contact with fire - your comments about IR radiation seem to imply that IR alone will cause ignition, which is rarely if ever the case.

Here is a story about a bunch of people who survived the Camp fire in Paradise, CA, surrounded by the raging inferno, by staying in the middle of a parking lot: https://www.firehouse.com/operations-training/wildland/news/...

[PaulDavisThe1st]

It is rarely the case, indeed.

However, in incidents like e.g. the Fort McMurray fire (Alberta, 2016), this is precisely what happens. One property with a heavy fuel load fanned by strong winds (i.e. plentiful O2 supply) gets hot enough that it causes ignition in a neighboring exposure.

In Ft. McMurray, there were documented cases of an entire 4+ bedroom house being reduced to ash in roughly 5 minutes. The heat generated by that process is easily sufficient to cause ignition in buildings <typical suburban layout> apart.

[hn_throwaway_99]

Even in that case I'm sure a huge part of the heat transfer is convection, especially with the high winds.

Comment I was replying to was talking about IR igniting things by shining through windows, which I believe is mostly bullshit.

[hyeonwho4]

Stone doesn't burn, and neither does concrete. Glass melts. Steel evidently didn't burn at the temperatures these fires got to. So it makes sense that a building made of concrete and steel with stone facades and fiberglass insulation would survive the fire, especially after clearing out and hydrating the surrounding landscape so it wouldn't have the density or flammability of a forest. The Getty Center may have gotten lucky, but they might have also earned their "luck" through investment and planning.

[Cheer2171]

Never have I seen a better case of projection on HN. You come off as so fucking smug yourself.