Automatic blower fan control for cars
In case you were not aware of it, the rush-hour can affect your health. Stuck in a traffic
jam or caught in the dense traffic in a big
city, car drivers are often forced to switch off
the fan to prevent being choked by the exhaust
fumes produeed by the vehicle in front of them.
Switching the fan on and off every minute
or so to keep the fumes out is a nuisance,
and calls for an automatie switch controlled
by the engine speed. Such switches exist, but
unfortunately for most of you they are only
found in top-of-the-range cars equipped with
an airconditioning system.