2. Existing auto air vent
In the solar-powered automatic air vent shown in Fig. 4 the vent is used to
remove hot air and replaces it with fresh and cool air. It removes nasty odors
from tobacco and pet etc. away form the vehicle. It can be attached to any car
window in seconds. It is with solar powered cell with no need of batteries.
However, there are several limitations of this system which include: it is
expensive, loss of cooling due to opening of the car window glass, risk of
security, and slow air removal.