9. Natural ventilation

Taking energy-using plant out of a building is certainly one way to cut back carbon emissions. A well-planned natural-ventilation project will allow a building owner to do just this. Natural ventilation uses the forces of wind and buoyancy to drive fresh air into buildings. It is arguably more an approach than a technology, but products can be designed to help the process carry out tasks such as filtering pollutants that may be caught up in the air. With legislation increasingly favouring natural, low-carbon solutions, could natural ventilation be the H&V technology to claim the crown of carbon champion?