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• 12:10, 27 September 2013 VDP talk contribs uploaded File:Heat recovery ventilation schematic.png (Schematic of a heat recovery ventilation system in a house. *1: fresh air (from outside the house); can be either cold or hot; must atleast be o°C or above; at days this is not reached the air entering via this pipe must be heated, see [http://en.wik...)