preferably the blower cover 330 is formed by injection molding of a synthetic resin material having a high heat resistant property a recess 331 for receiving a motor 350 driving the blower 340 therein is provided to the blower cover 330 moreover a motor guide 370 protrudes from a circumference of the recess 331 to load the motor 350 therein and to fix the motor 350 thereto a rotational shaft of the motor 350 penetrates into the blower cover 330 to be coupled to the blower 340 for shaft coupling an operation of the hot air supplying apparatus according to the present invention is explained as follows fig4 is a graph of temperature measurement results at major parts of a blower and drying duct on a drying operation referring to fig4 temperature sensors are attached to a portion a of the blower cover 300 having the blower 340 installed therein a heater entrance b in the vicinity of a connecting part between the blower cover 330 and the upper housing 310 and a portion c of the upper housing 310 provided over the heater 360 respectively a drying cycle is then carried out to measure temperature variations of the respective portions a b and c according to time as a result of the test the vicinity a of the blower 340 has a.