For those, like me, who didn't know: ERV == Energy Recovery Ventilator See https://en.wikipedia.org/wiki/Energy_recovery_ventilation https://en.wikipedia.org/

For those, like me, who didn't know: ERV == Energy Recovery Ventilator See https://en.wikipedia.org/wiki/Energy_recovery_ventilation https://en.wikipedia.org/wiki/Energy_recovery_ventilation