The Xpelair Natural Air 180 Mechanical Ventilation with Heat Recovery (MVHR) unit with pre heater provides whole-house ventilation - fresh air is supplied from outside the premises, while warm, stale, damp air is continuously extracted out. If pollutants are getting trapped inside homes, we need an efficient method of removing them. The Natural Air 180 offers efficient, balanced ventilation that produces healthy indoor air quality while saving energy with its efficient EC ball-bearing motor. Ultra-fine G3 filters ensure a pollutant-free environment. The unit features 100% summer bypass and winter defrost functions for year-round temperature comfort.