Counterflow Decentralised HRV/ERV Products

Counterflow decentralised HRV/ERV systems, such as the LUNOS Nexxt, operate using two fans and a central counterflow heat exchanger core. Unlike alternating push-pull decentralised units (with one fan per unit), which reverse direction every 40–90 seconds, these systems maintain constant two-way airflow, much like larger centralised HRV/ERV systems. One fan continuously draws in fresh outside air while the other simultaneously exhausts stale indoor air, with both air streams passing through the counterflow core. This design allows for efficient heat (and, in the case of ERV, moisture) transfer between the outgoing and incoming air, providing balanced ventilation, improved comfort, and quieter operation without creating pressure imbalances in the room.