Any ventilator. Heat recovery is optional - it is really hard to recover heat from lukewarm air without actually recirculating most of it. The pressure drop re

Any ventilator. Heat recovery is optional - it is really hard to recover heat from lukewarm air without actually recirculating most of it. The pressure drop requires more electricity due to more power in the pumps, making it a relatively bad trade - only heatpipe systems are worth anything.