[charlie1218]

In an area you should have one extinguisher on the wall within 35 feet of every point. So if you have a room 100 x 100, you should have roughly 8 extinguishers, to per wall placed 35 feet from each corner. I recommend that they be 10-15 lbs because that is quite a bit of supression. If you have alot of stuff crammed in there, get more or heavier extinguishers. In general use ABC dry chem. For electrical that you dont want harmed, get CO2 have a dry chem to go with it. this is b.c CO2 cant be used on Class A (wood, paper, rags, trash, etc)