The enclosure needs a vent else there can be a condensation problem. The
vent needs to be effectively screened so insects and critters don't call
the enclosure home. Power to operate the logic of the tuner made for
indoor use may be a slight bother, though the 120 volt outlet with GFCI
should be reasonably safe.
Alternatively, the tuner enclosure can be tightly sealed but then needs
some humidity control like a handful of silica gel to prevent
condensation on the circuits at low air temperatures. Or some external
heat applied to keep the enclosure above a condensation temperature.
Where there's fog and a vent, a bit of heat in the enclosure might not
be a bad idea either to keep the circuits dry.
73, Jerry, K0CQ
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