The Code for Sustainable Homes was introduced in this country in December 2007. Since May 2008, all new public-sector homes are measured against this environmental impact rating system. There are nine criteria: energy and carbon dioxide emissions, water, materials, surface water run-off, waste, pollution, health and well-being, management, and ecology. The rating system serves as an incentive for builders to achieve the highest construction standards. It also encourages consumers to become more concerned with the sustainability of their homes.

Electrical and mechanical contractors act as sustainability experts by choosing the right ventilation systems for their projects. For example, mechanical ventilation with heat recovery (MVHR) is capable of collecting and exhausting stale moist air from inside the house while simultaneously drawing clean fresh air from the outside. In the process, up to 90 percent of heat is captured from the outgoing air and transferred to the incoming air, enhancing the house’s energy efficiency.

Passive stack ventilation (PSV) and central mechanical extract ventilation (MEV) are also considered superior to conventional extractor fans in terms of energy efficiency and sustainability. For example, PSV takes advantage of both the effect of wind passing over buildings and the difference in temperature between indoors and outdoors. There is no mechanical fan used.

Apart from government supervision and industry expertise, consumers are playing an increasingly important role in promoting and implementing the Code for Sustainable Homes. Demanding the design and installation of appropriate ventilation systems in properties ensures the protection of the health and well-being of all occupants both indoors and outdoors.