A blower includes a base having a transverse passage for receiving a motor therein
and a fan device driven by the motor extends from a hole in an end of the base.
A casing including an outlet is connected to the base and mounted to the fan device.
An anti-back device is engaged in the outlet and includes a frame to which a plate
is pivotably connected. The plate is opened by the air sent via the fan device
in one direction and seals the outlet when air goes in opposite direction.
