Doser ventilation/max air temp?

[origreefer]

I located my doser in my garage which can get below freezing in winter. I was thinking of covering it with a styroform cooler and put a ecotech radion ballast in the cooler too to provide some radiant heat. Anyone know how much ventilation the doser needs if any?

 

[Antipodes]

The doser is not a sealed unit.
If it is actually freezing water in your garage, surely the tubes are frozen so it will not pump anyway.

It is not the cold that will affect the electronics so much as excessive moisture.
So it you do this mod, I would make sure it is at least vented to atmosphere by a hole in the box so that the cool air outside will take away any moisture that may build up in the box.