sokaze-ki q uses fluid dynamics to boost how much air is released .
air is brought through the rear of the 10-inch -lrb- 25 cm -rrb- device .
a ` high-pressure jet airflow ' then turns this air into blast of directed ` wind '
the ` q ' fan is on sale in japan for ¥ 39,350 -lrb- £ 220 -rrb- .