Troublesome techncal flaws

[toefur]

I assumed there was not ENOUGH oxygen to feed the fire or to be fit for breathing.

[Shabadoojr]

The generator requiring oxygen thing didn't occur to me, but I was expecting a giant thunderstorm once the Dome lifted as the warm air from inside collided with the cold air outside. Admittedly, I'm no meteorologist, but isn't that how storm fronts are formed?

[Robert Gray]

While I have no idea if this will satisfy you on a technical level or not, Big Jim took refuge in a bomb shelter. Many of those are made to be air tight and of a size which contains a fair amount of air (and sometimes back supplies). The air which they were breathing and which kept the generator going was what was in the box.

[Shabadoojr]

Also, I seem to remember reference to an air purifier too.

[JoAnn Doud]

Oops ! I thought I saw in a forward of one of his books that he doesn't care for research because it is too tedious. My mistake I think!

I think King has said that he does not relish doing research. I don't blame him. It takes away from the fun and freedom of the creative process.
I am always willing to ignore little discrepancies in fiction. I think to dwell on them is pedantic.
The great appeal of fiction is we can create our own worlds with rules and atmoshperes and gravities, silliness and oddities that do not have to follow along with those in this, the real world.