"Inflatable Air Blower" operation is changed as the case of heat, at a slower speed operation, the fan will have less noise and consumes less energy. In most of the design requirements, the fan speed operation in a few hours after the air temperature is usually lower than the maximum design temperature value. Under normal circumstances, low-speed operation of the "Inflatable Air Blower" can be enough to complete its work. DC fan when temperature change is slow, slower speed of the fan changes, will not suddenly change "Inflatable Air Blower" speed and noise. The reaction time depends mainly on the length of the sensor of its thermally-induced sensitivity.