A locking mechanism of a child car seat includes a locking member which is capable of being engaged with a pin disposed in an armrest of a stroller body and disengaged therefrom, a stopper which is rotated together with the locking member, and a stopper unlocking member having an engagement portion capable of being engaged with a stopper staged part of the stopper and disengaged therefrom. The printed circuit board serves to establish the fan housing in cooperation with the housing wall. To install, an access hole may be drilled into the desired wall or wall panel without the need for chiseling or chipping.