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On my non pressurized Lancair IV I am using a mac servo to open and shut a flapper door at the rear of the over head so that I can shut off all cool outside air in the winter.  I did not want the whole overhead panel to be cold and need to shut off the air at the individual vents.  The flapper withn servo works real good on the ground.  I wont be flying until sometime next summer              or fall               or--------

Tom Byrnes

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