This SmartVent Positive SV04 home ventilation system in white, offers a maximum airflow of 920 Cubic-m/hr. It draws fresh and dry air by filtering the air from pollens, dust and allergens. This system minimizes the infections caused by viruses, mould problems, respiratory problems, smoke and carbon monoxide. Intelligent control system with wall-mounted digital controller allows to control air flow. This system minimizes condensation, mould and mildew in your home. It automatically controls fan speed.