Fans on projectors

[P3D Paul S. Boyer <boyer@xxxxxxxxxxxxx>]

In his discussion of upgrading a stereo projector from 500 to
750-watt bulbs, Dr. T. mentions a user-installed switch which enables
the fan to run which the bulbs are off.  It is suggested that the fan
can be run after projection to cool off the projector.

This practice is no longer deemed advisable by no less an authority
than the Great Yellow Father (Kodak).  When the projector is off, no
further heat is being added, and there is little reason to run a fan.
 Running the fan simply cools the bulbs faster, adding to thermal
stress on their filaments, and shortening bulb life.

So, when you are finished, turn off bulbs and fan simultaneously, and
patiently wait for the for the projector to cool.  It is best *not*
to move the projector which the filaments are hot, as they are weaker
in the warm condition, and are more easily damaged by jarring.

--Paul S. Boyer   <boyer@xxxxxxxxxxxxx>


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