Use of natural ventilation.

Outlines ventilation needs to show that odour dilution and moisture control are the major winter factors. Detailed studies on 24 well insulated houses show that window opening habits are clearly linked to outdoor temperature, more windows being opened in milder weather.< Shows from energy input analysis that space heating only provides a quarter of the total heat, the remainder coming from casual sources. Analysis of energy loss suggests that a third of the losses are attributable to ventilation, the remainder through the building fabric. This ventilation loss is equally divided between infiltration and window opening. Average house seasonal ventilation rate is half an air change per hour.