Blown polyethylene ducts

Outdoor and exhaust air ducts must be insulated with moisture-resistant heat/cold insulation for two reasons:

• cold outdoor air can warm from the heated room, increasing the heat loss of this room;
• room humidity to condense on the cooled duct surfaces.

The recuperator should be placed as close as possible to the heated area, the body is thermally insulated to avoid heat loss with the surrounding environment.
If the supply air is additionally heated (e.g. air heating), the supply air ducts must be in the heated area or must be insulated.