Is it appropriate for the back of the generator is outside the risk?

For relatively small enclosures, in case of a real fire, hot air, mixed with aerosols, dust, etc., tends to rise, and since generators should be located at the top of the premises is to occur if making a bubble of hot air foam, the expansion force of the air is greater than the surface tension of the microfilm and the foam breaks, bursting so a much smaller amount of foam is achieved. It is therefore desirable that the foam forms with clean air at room temperature, it is necessary to study the location of generators and try to get most fulfilling this condition.