I want to build the following invention for a client.  There is no  
NDA.  A air mover of some sort forces air up a tube and out some jets  
on the windshield/windscreen of a car/truck.  The air is heated via  
compression and possibly an electric heater.  The hot air defrosts  
the WS and melts thin coatings of ice.

The "Hottie" as I am calling it, is powered from an Auxillary  Lead  
Acid Battery that is charged by the vehicle alternator.  When the  
engine is not running , the Hottie can still defrost the glass  and  
also heat the WS wipers.  I plan to put a set of jets across the top  
of the WS, anchored and shaped so they offer little wind resistance.   
The battery will disconnect when it is out of SOA. ( Safe Operating  
Area )  Optionally, the Hottie may turn the wipers on if snow/sleet  
falls and keep the WS free of snow accumulation.  Even when the  
vehicle is unoccupied.

There will sensors ( don't know what yet ) that will detect the WS is  
fogged or iced.

The main vehicle battery will not be discharged.  Everything will fit  
in the engine compartment.

Has anyone suggestions for the air mover ?

cc
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