Solid suggestions!

I don't know why it gave me a memory of the server room at a building I worked at. If there was a fire, you had to leave the room immediately because the main fire suppression device was something that pumped all the oxygen out of the room, depriving the fire of the oxygen that allows it to burn.

Meaning, if you hung around in that room after the fire alarm went off, you'd have a good chance of getting stuck in there and dying of asphyxiation.

Not flour, though! A friend once had food in a pot on the stove catch fire, and she knew about putting salt or baking soda on oily fires, but in haste, grabbed the flour, instead. On the bright side, the resulting explosion did put the fire out by consuming the oxygen, but it cracked the kitchen window.

For a fire in a pot or pan, having a well-fitting lid ready, and sliding it on, is most effective. Make it a habit as you get out the pan to get out a lid that completely covers it, and put it within reach.

Edit to add: I have a fire extinguisher on the kitchen wall as well, because sometimes the fire isn't contained/containable. When I replaced my old unused one, I took it outside and practiced with it until it was empty, which was fun and educational.

Lol, white dust is what a dry powder extinguisher is meant to spit out. Ths issue is that if the powder becomes too compacted, it won't come out. Look up a video of a dry powder extinguisher in use to see if it's working like it should.

However, they are more-or-less single use. If you've used it, even partially, you should really get it recharged or replaced.