Graham Hi!
I blew air up over front screen using 2 X 12V Computer Fans controlled by
variable resistance from warmer air in Instrument panel housing. They worked
well. The Fans were small at about 50cms maximum as remember. If you intend
to draw air down screen in some way by reduced pressure I'm not sure that
will work as you are drawing the cabin air down that is already causing
mist.
The screen will attract mist throughout Autumn to late spring so it's worth
an investment in a solution. Others will make comment I'm sure.
Regards
Gerry
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