Business and House Size vary, so as the placement of Fire Extinguisher. For a Small Room, only one fire extinguisher enough to go, whereas in a large room you will need 2-3 Fire Extinguisher. If it is a factory, you will need bulk fire extinguisher or if it is a flammable warehouse or Factory, you just need to install the auto fire extinguisher or install huge numbers of Fire Extinguisher, to overcome high or Strong Fire.