Reliable, efficient, and versatile mechanical ventilation unit with heat recovery for commercial application. The machine is available in six configurations including: countercurrent exchanger made of aluminium with efficiency higher than 80%, EC centrifugal fans, filter pressure switch (only with Smart EB electronics), F7 filter (ISO ePM1 70%) on the supply line and M5 (ISO ePM10 50%) on the extract line, and by‐pass for free‐cooling. Depending on the desired configuration, the following components may be also included: Easy or Smart control panel, canopy and IP55 switchboard, QA air quality sensor, and ModBus.