If you install the ventilation unit outside the climate screen, it is important to protect the condensate drain from frost. Of course, the drain should be thoroughly insulated, but even that may be insufficient.
Nilan can supply an external heating cable that you run along the exterior of the condensate drain before insulating it. This way you will have a frost-free condensate drain that does not get blocked. The heating cable has an integral thermostat that regulates the level of heating in accordance with the temperature of the surroundings.
The cable is available in two lengths: 3 m or 5 m.