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AirDoor is an energy-saving air curtain engineered in the UK by Wirth Research, a team led by former Formula 1 designer Nick Wirth. Rather than heating or cooling air, CFD-shaped three-sided airflow keeps outside air outside: up to 31% less annual gas in a mid-sized supermarket, up to 54% less cold-weather electricity in boutique retail, and heat pump sizing cut by up to a third. Innovate UK co-funded development. Winner, Queen's Award for Enterprise in Sustainable Development.