Thats why I like the CO2 extinguishers, because they have a huge cooling effect, and why they are best for a fire with supplied O2 (like an O/A torch), because they bring it below ingition temprature.
Yes, they are great. They do tend to be kind of heavy. I tried to use one on a roof to kill hornets once. After I sprayed them, they would fall out of the air, land on the roof, thaw out, and come back for more. They won, I ran out of gas before they did. :laughing:
I also liked the old H2O extinguishers, we used them a lot in the body shop.
You don't need to use a lot of halon to put out a fire. I can't remember the numbers I was told, but you only have to lower the oxygen level slightly, and the fire will go out. I can attest from the tests we did, there is still plenty of oxygen to breath, provided you do it correctly. I could not tell the halon was in the air, although some are probably very sensitive to it. Once the fire is out, you will need to either leave, or ventilate the area anyway, because of the smoke.