Method for mixing outside air with room air for a ventilation system heat exchanger has overlying metal plates having contrary hole patterns which can relatively positioned to each other to vary the throughput

摘要

The heat exchanger (8) has an extractor fan (3) and return air fan (2) drawing air through the mixer (9) having thermostats (5,6) at the entry and outlet and (7) in the room air return. A control unit (4) sets the mixer plates in accordance with the thermostat outputs.