A hair dryer is composed of a set of electric heating wires and a high-speed small fan. When powered on, the electric heating wire generates heat, and the wind blown out by the fan passes through the electric heating wire and becomes hot air. If only the small fan rotates and the electric heating wire is not hot, then what is blown out is only wind and not heat.
The air blown by a hair dryer belongs to dry air. If used for too long, it is easy to cause water loss and heat damage. The secret to minimizing damage is to pat dry the hair with a towel, gently comb the hair with your hands, and then use a hair dryer.