Re: Cooling fans on projectors

[P3D KENNETH LUKER <KLUKER@xxxxxxxxxxxxxxxxxxxxxxx>]

>This makes me wonder... Why did it take Kodak so many years to come 
up with this simple recommendation?  For years and years projectors 
were supplied with a fan that can be operated separately and we were 
>advised to use it to cool the system after the bulbs are turned off.  

As a youth working in a photo store, I overheard the salesmen telling 
customers what I still believe are good reasons for a separately 
switched fan:  When bringing a projector into the house from a cold 
car to show slides away from home, a fan can help bring the bulbs 
up to room temperature before they are lit, thus reducing the risk 
of shattering.  Also, after the show, taking the projector out into 
sub-zero weather while the bulb is still hot can risk a failure.  
Finally, sometimes a projector must be moved immediately after the 
show--perhaps to set it on the floor to allow the table to be used 
for refreshments, for example.  The fan can cool the lamps more 
quickly, reducing the risk of jarring a hot filament.  
Ken Luker
_______________________________________________________________

Kenneth Luker, Assistant Director
Systems and Technical Services
Marriott Library
University of Utah
Salt Lake City, Utah
KLUKER@xxxxxxxxxxxxxxxxxxxxxxx


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